diff --git a/src/morphism.rs b/src/morphism.rs
index ba7cc23..8cf6a02 100644
--- a/src/morphism.rs
+++ b/src/morphism.rs
@@ -1,9 +1,10 @@
 use {
     crate::{
-        TypeTerm, TypeID,
-        unification::UnificationProblem,
+        unification::UnificationProblem, TypeDict, TypeID, TypeTerm,
+        pretty::*,
+        sugar::SugaredTypeTerm,
     },
-    std::collections::HashMap
+    std::{collections::HashMap, u64}
 };
 
 //<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
@@ -14,6 +15,17 @@ pub struct MorphismType {
     pub dst_type: TypeTerm,
 }
 
+impl MorphismType {
+    pub fn normalize(self) -> Self {
+        MorphismType {
+            src_type: self.src_type.normalize().param_normalize(),
+            dst_type: self.dst_type.normalize().param_normalize()
+        }
+    }
+}
+
+//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
+
 pub trait Morphism : Sized {
     fn get_type(&self) -> MorphismType;
     fn map_morphism(&self, seq_type: TypeTerm) -> Option< Self >;
@@ -23,25 +35,50 @@ pub trait Morphism : Sized {
     }
 }
 
+//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct MorphismInstance<M: Morphism + Clone> {
+    pub halo: TypeTerm,
+    pub m: M,
+    pub σ: HashMap<TypeID, TypeTerm>
+}
+
+impl<M: Morphism + Clone> MorphismInstance<M> {
+    pub fn get_type(&self) -> MorphismType {
+        MorphismType {
+            src_type: TypeTerm::Ladder(vec![
+                self.halo.clone(),
+                self.m.get_type().src_type.clone()
+            ]).apply_substitution(&|k| self.σ.get(k).cloned())
+            .clone(),
+
+            dst_type: TypeTerm::Ladder(vec![
+                self.halo.clone(),
+                self.m.get_type().dst_type.clone()
+            ]).apply_substitution(&|k| self.σ.get(k).cloned())
+            .clone()
+        }.normalize()
+    }
+}
+
+//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
+
+#[derive(Clone)]
+pub struct MorphismPath<M: Morphism + Clone> {
+    pub weight: u64,
+    pub cur_type: TypeTerm,
+    pub morphisms: Vec< MorphismInstance<M> >
+}
+
+//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
+
 #[derive(Clone)]
 pub struct MorphismBase<M: Morphism + Clone> {
     morphisms: Vec< M >,
     seq_types: Vec< TypeTerm >
 }
 
-//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
-
-impl MorphismType {
-    pub fn normalize(self) -> Self {
-        MorphismType {
-            src_type: self.src_type.normalize(),
-            dst_type: self.dst_type.normalize()
-        }
-    }
-}
-
-//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
-
 impl<M: Morphism + Clone> MorphismBase<M> {
     pub fn new(seq_types: Vec<TypeTerm>) -> Self {
         MorphismBase {
@@ -54,176 +91,196 @@ impl<M: Morphism + Clone> MorphismBase<M> {
         self.morphisms.push( m );
     }
 
-    pub fn enum_morphisms(&self, src_type: &TypeTerm)
-    -> Vec< (HashMap<TypeID, TypeTerm>, TypeTerm) >
+    pub fn enum_direct_morphisms(&self, src_type: &TypeTerm)
+    -> Vec< MorphismInstance<M> >
     {
         let mut dst_types = Vec::new();
-
-        // first enumerate all "direct" morphisms,
         for m in self.morphisms.iter() {
-            if let Ok(σ) = crate::unification::unify(
-                &m.get_type().src_type,
-                &src_type.clone().normalize()
+            if let Ok((halo, σ)) = crate::unification::subtype_unify(
+                &src_type.clone().param_normalize(),
+                &m.get_type().src_type.param_normalize(),
             ) {
-                let dst_type =
-                    m.get_type().dst_type.clone()
-                    .apply_substitution( &|x| σ.get(x).cloned() )
-                    .clone();
-
-                dst_types.push( (σ, dst_type) );
+                dst_types.push(MorphismInstance{ halo, m: m.clone(), σ });
             }
         }
+        dst_types
+    }
+
+    pub fn enum_map_morphisms(&self, src_type: &TypeTerm)
+    -> Vec< MorphismInstance<M> > {
+        let src_type = src_type.clone().param_normalize();
+        let mut dst_types = Vec::new();
 
-        // ..then all "list-map" morphisms.
         // Check if we have a List type, and if so, see what the Item type is
-
         // TODO: function for generating fresh variables
-        let item_variable = TypeID::Var(100);
+        let item_variable = TypeID::Var(800);
 
         for seq_type in self.seq_types.iter() {
-        if let Ok(σ) = crate::unification::unify(
-            &TypeTerm::App(vec![
-                seq_type.clone(),
-                TypeTerm::TypeID(item_variable)
-            ]),
-            &src_type.clone().param_normalize(),
-        ) {
-            let src_item_type = σ.get(&item_variable).unwrap().clone();
+            if let Ok((halo, σ)) = crate::unification::subtype_unify(
+                &src_type,
+                &TypeTerm::App(vec![
+                    seq_type.clone(),
+                    TypeTerm::TypeID(item_variable)
+                ])
+            ) {
+                let src_item_type = σ.get(&item_variable).expect("var not in unificator").clone();
+                for item_morph_inst in self.enum_morphisms( &src_item_type ) {
 
-            for (γ, dst_item_type) in self.enum_morphisms( &src_item_type ) {
-                let dst_type =
-                        TypeTerm::App(vec![
-                            seq_type.clone(),
-                            dst_item_type.clone()
-                                .apply_substitution(
-                                    &|x| γ.get(x).cloned()
-                                ).clone()
-                        ]).normalize();
+                    let mut dst_halo_ladder = vec![ halo.clone() ];
+                    if item_morph_inst.halo != TypeTerm::unit() {
+                        dst_halo_ladder.push(
+                            TypeTerm::App(vec![
+                                seq_type.clone().get_lnf_vec().first().unwrap().clone(),
+                                item_morph_inst.halo.clone()
+                            ]));
+                    }
 
-                dst_types.push( (γ.clone(), dst_type) );
+                    dst_types.push(
+                        MorphismInstance {
+                            halo: TypeTerm::Ladder(dst_halo_ladder).normalize(),
+                            m: item_morph_inst.m.map_morphism(seq_type.clone()).expect("couldnt get map morphism"),
+                            σ: item_morph_inst.σ
+                        }
+                    );
+                }
             }
         }
-        }
 
         dst_types
     }
 
-    pub fn enum_morphisms_with_subtyping(
-        &self,
-        src_type: &TypeTerm,
-    ) -> Vec<(TypeTerm, TypeTerm, HashMap<TypeID, TypeTerm>)> {
-        let mut src_lnf = src_type.clone().get_lnf_vec();
-        let mut halo_lnf = vec![];
+    pub fn enum_morphisms(&self, src_type: &TypeTerm) -> Vec< MorphismInstance<M> > {
         let mut dst_types = Vec::new();
-
-        while src_lnf.len() > 0 {
-            let src_type = TypeTerm::Ladder(src_lnf.clone());
-            let halo_type = TypeTerm::Ladder(halo_lnf.clone());
-
-            for (σ, t) in self.enum_morphisms(&src_type) {
-                dst_types.push((
-                    halo_type
-                        .clone()
-                        .apply_substitution(&|x| σ.get(x).cloned())
-                        .clone(),
-                    t.clone().apply_substitution(&|x| σ.get(x).cloned()).clone(),
-                    σ,
-                ));
-            }
-
-            // continue with next supertype
-            halo_lnf.push(src_lnf.remove(0));
-        }
-
+        dst_types.append(&mut self.enum_direct_morphisms(src_type));
+        dst_types.append(&mut self.enum_map_morphisms(src_type));
         dst_types
     }
 
     /* try to find shortest morphism-path for a given type
      */
-    pub fn find_morphism_path(&self, ty: MorphismType)
-    -> Option< Vec<TypeTerm> >
+    pub fn find_morphism_path(&self, ty: MorphismType
+        /*, type_dict: &mut impl TypeDict*/
+    )
+    -> Option< Vec<MorphismInstance<M>> >
     {
         let ty = ty.normalize();
-
         let mut queue = vec![
-            (0, vec![ ty.src_type.clone().normalize() ])
+            MorphismPath { weight: 0, cur_type: ty.src_type.clone(), morphisms: vec![] }
         ];
 
         while ! queue.is_empty() {
-            queue.sort_by( |&(w1,_),&(w2,_)| w2.cmp(&w1));
+            queue.sort_by( |p1,p2| p2.weight.cmp(&p1.weight));
 
-            if let Some((current_weight, current_path)) = queue.pop() {
-                let current_type = current_path.last().unwrap();
-                for (h, t, σp) in self.enum_morphisms_with_subtyping(&current_type) {
-                    let tt = TypeTerm::Ladder(vec![h, t]).normalize();
-
-                    if !current_path.contains(&tt) {
-                        let unification_result = crate::unification::unify(&tt, &ty.dst_type);
-                        let morphism_weight = 1;
-                        /*self.find_morphism( &tt ).unwrap().0.get_weight()*/
-
-                        let new_weight = current_weight + morphism_weight;
-                        let mut new_path = current_path.clone();
-
-                        new_path.push(tt);
-
-                        for n in new_path.iter_mut() {
-                            n.apply_substitution(&|x| σp.get(x).cloned());
+            if let Some(mut cur_path) = queue.pop() {
+                if let Ok((halo, σ)) = crate::unification::subtype_unify( &cur_path.cur_type, &ty.dst_type ) {
+                    // found path
+                    for n in cur_path.morphisms.iter_mut() {
+                        let mut new_σ = HashMap::new();
+                        for (k,v) in σ.iter() {
+                            new_σ.insert(
+                                k.clone(),
+                                v.clone().apply_substitution(&|k| σ.get(k).cloned()).clone()
+                            );
+                        }
+                        for (k,v) in n.σ.iter() {
+                            new_σ.insert(
+                                k.clone(),
+                                v.clone().apply_substitution(&|k| σ.get(k).cloned()).clone()
+                            );
                         }
 
-                        if let Ok(σ) = unification_result {
-                            for n in new_path.iter_mut() {
-                                n.apply_substitution(&|x| σ.get(x).cloned());
-                            }
-                            return Some(new_path);
-                        } else {
-                            queue.push((new_weight, new_path));
+                        n.σ = new_σ;
+                    }
+
+                    return Some(cur_path.morphisms);
+                }
+
+                //eprintln!("cur path (w ={}) : @ {}", cur_path.weight, cur_path.cur_type.clone().sugar(type_dict).pretty(type_dict, 0) );
+                for next_morph_inst in self.enum_morphisms(&cur_path.cur_type) {
+                    let dst_type = next_morph_inst.get_type().dst_type;
+
+                    let mut creates_loop = false;
+
+                    let mut new_path = cur_path.clone();
+                    for n in new_path.morphisms.iter_mut() {
+                        let mut new_σ = HashMap::new();
+                        for (k,v) in n.σ.iter() {
+                            new_σ.insert(
+                                k.clone(),
+                                v.clone().apply_substitution(&|k| next_morph_inst.σ.get(k).cloned()).clone()
+                            );
                         }
+                        for (k,v) in next_morph_inst.σ.iter() {
+                            new_σ.insert(
+                                k.clone(),
+                                v.clone().apply_substitution(&|k| next_morph_inst.σ.get(k).cloned()).clone()
+                            );
+                        }
+                        n.σ = new_σ;
+                    }
+
+                    for m in new_path.morphisms.iter() {
+                        if m.get_type().src_type == dst_type {
+                            creates_loop = true;
+                            //eprintln!("creates loop..");
+                            break;
+                        }
+                    }
+
+                    if ! creates_loop {
+                        /*eprintln!("next morph ? \n    {}\n--> {} ",
+                            next_morph_inst.get_type().src_type.sugar(type_dict).pretty(type_dict, 0),
+                            next_morph_inst.get_type().dst_type.sugar(type_dict).pretty(type_dict, 0)
+                        );
+                        eprintln!("....take!\n  :: halo = {}\n  :: σ = {:?}", next_morph_inst.halo.clone().sugar(type_dict).pretty(type_dict, 0), next_morph_inst.σ);
+                        */
+                        new_path.weight += next_morph_inst.m.weight();
+                        new_path.cur_type = dst_type;
+                        new_path.morphisms.push(next_morph_inst);
+                        queue.push(new_path);
                     }
                 }
             }
         }
-
         None
     }
 
-    /// finde a morphism that matches the given morphism type
-    pub fn find_morphism(&self, ty: &MorphismType)
-    -> Option< ( M, HashMap<TypeID, TypeTerm> ) > {
-
-        // try to find primitive morphism
+/*
+    pub fn find_direct_morphism(&self, ty: &MorphismType) -> Option< (M, HashMap<TypeID, TypeTerm>) > {
         for m in self.morphisms.iter() {
             let unification_problem = UnificationProblem::new(
                 vec![
-                    ( ty.src_type.clone().normalize(), m.get_type().src_type.clone() ),
-                    ( ty.dst_type.clone().normalize(), m.get_type().dst_type.clone() )
+                    ( ty.src_type.clone(), m.get_type().src_type.clone() ),
+                    ( m.get_type().dst_type.clone(), ty.dst_type.clone() )
                 ]
             );
 
-            let unification_result = unification_problem.solve();
-            if let Ok(σ) = unification_result {
+            let unification_result = unification_problem.solve_subtype();
+            if let Ok((halo, σ)) = unification_result {
                 return Some((m.clone(), σ));
             }
         }
+        None
+    }
 
-        // try list-map morphism
+    pub fn find_map_morphism(&self, ty: &MorphismType) -> Option< (M, HashMap<TypeID, TypeTerm>) > {
         for seq_type in self.seq_types.iter() {
             eprintln!("try seq type {:?}", seq_type);
 
-            eprintln!("");
-
-            if let Ok(σ) = UnificationProblem::new(vec![
+            if let Ok((halo, σ)) = UnificationProblem::new(vec![
                 (ty.src_type.clone().param_normalize(),
                     TypeTerm::App(vec![ seq_type.clone(), TypeTerm::TypeID(TypeID::Var(100)) ])),
-                (ty.dst_type.clone().param_normalize(),
-                    TypeTerm::App(vec![ seq_type.clone(), TypeTerm::TypeID(TypeID::Var(101)) ])),
-            ]).solve() {
+
+                (TypeTerm::App(vec![ seq_type.clone(), TypeTerm::TypeID(TypeID::Var(101)) ]),
+                    ty.dst_type.clone().param_normalize()),
+            ]).solve_subtype() {
                 // TODO: use real fresh variable names
                 let item_morph_type = MorphismType {
                     src_type: σ.get(&TypeID::Var(100)).unwrap().clone(),
                     dst_type: σ.get(&TypeID::Var(101)).unwrap().clone(),
                 }.normalize();
 
+                //eprintln!("Map Morph: try to find item-morph with type {:?}", item_morph_type);
                 if let Some((m, σ)) = self.find_morphism( &item_morph_type ) {
                     if let Some(list_morph) = m.map_morphism( seq_type.clone() ) {
                         return Some( (list_morph, σ) );
@@ -235,33 +292,17 @@ impl<M: Morphism + Clone> MorphismBase<M> {
         None
     }
 
-    pub fn find_morphism_with_subtyping(&self, ty: &MorphismType)
-    -> Option<( M, TypeTerm, HashMap<TypeID, TypeTerm> )> {
-        let mut src_lnf = ty.src_type.clone().get_lnf_vec();
-        let mut dst_lnf = ty.dst_type.clone().get_lnf_vec();
-        let mut halo = vec![];
-
-        while src_lnf.len() > 0 && dst_lnf.len() > 0 {
-            if let Some((m, σ)) = self.find_morphism(&MorphismType{
-                src_type: TypeTerm::Ladder(src_lnf.clone()),
-                dst_type: TypeTerm::Ladder(dst_lnf.clone())
-            }) {
-                halo.push(src_lnf.get(0).unwrap().clone());
-                return Some((m,
-                    TypeTerm::Ladder(halo).apply_substitution(&|x| σ.get(x).cloned()).clone(),
-                    σ));
-            } else {
-                if src_lnf[0] == dst_lnf[0] {
-                    src_lnf.remove(0);
-                    halo.push(dst_lnf.remove(0));
-                } else {
-                    return None;
-                }
-            }
+    pub fn find_morphism(&self, ty: &MorphismType)
+    -> Option< ( M, HashMap<TypeID, TypeTerm> ) > {
+        if let Some((m,σ)) = self.find_direct_morphism(ty) {
+            return Some((m,σ));
+        }
+        if let Some((m,σ)) = self.find_map_morphism(ty) {
+            return Some((m, σ));
         }
-
         None
     }
+    */
 }
 
 //<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
diff --git a/src/steiner_tree.rs b/src/steiner_tree.rs
index 6e2443d..091d764 100644
--- a/src/steiner_tree.rs
+++ b/src/steiner_tree.rs
@@ -108,28 +108,24 @@ impl PathApproxSteinerTreeSolver {
 
                 // check all existing nodes..
 
-                if new_path_iter.peek().unwrap() == &src_type {
+                if new_path_iter.peek().unwrap().get_type().src_type == src_type {
                     new_path_iter.next();
                 }
 
                 for mt in tree.iter() {
                     //assert!( mt.src_type == &src_type );
                     if let Some(t) = new_path_iter.peek() {
-                        if &mt.dst_type == t {
+                        if &mt.dst_type == &t.get_type().src_type {
                             // eliminate this node from new path
-                            src_type = new_path_iter.next().unwrap().clone();
+                            src_type = new_path_iter.next().unwrap().get_type().src_type;
                         }
                     } else {
                         break;
                     }
                 }
 
-                for dst_type in new_path_iter {
-                    tree.push(MorphismType {
-                        src_type: src_type.clone(),
-                        dst_type: dst_type.clone()
-                    });
-                    src_type = dst_type;
+                for m in new_path_iter {
+                    tree.push(m.get_type());
                 }
             } else {
                 eprintln!("could not find path\nfrom {:?}\nto {:?}", &self.root, &goal);
@@ -223,8 +219,9 @@ impl SteinerTreeProblem {
 
             // extend the tree by one edge and add it to the queue
             for src_type in current_nodes {
-                for (dst_halo, dst_ty, σ) in morphisms.enum_morphisms_with_subtyping(&src_type) {
-                    let dst_type = TypeTerm::Ladder(vec![dst_halo, dst_ty]).normalize();
+                for next_morph_inst in morphisms.enum_morphisms(&src_type) {
+                    //let dst_type = TypeTerm::Ladder(vec![dst_halo, dst_ty]).normalize();
+                    let dst_type = next_morph_inst.get_type().dst_type;
 
                     if current_tree.contains( &dst_type ).is_none() {
                         let mut new_tree = current_tree.clone();
diff --git a/src/test/morphism.rs b/src/test/morphism.rs
index ae3775f..4d33df6 100644
--- a/src/test/morphism.rs
+++ b/src/test/morphism.rs
@@ -1,5 +1,5 @@
 use {
-    crate::{dict::*, parser::*, unparser::*, morphism::*, steiner_tree::*, TypeTerm}
+    crate::{dict::*, parser::*, unparser::*, morphism::*, TypeTerm}
 };
 
 //<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>\\
@@ -73,23 +73,105 @@ fn morphism_test_setup() -> ( BimapTypeDict, MorphismBase<DummyMorphism> ) {
 fn test_morphism_path() {
     let (mut dict, mut base) = morphism_test_setup();
 
+    let path = base.find_morphism_path(MorphismType {
+        src_type: dict.parse("ℕ ~ <PosInt 10 BigEndian> ~ <Seq <Digit 10> ~ Char>").unwrap(),
+        dst_type: dict.parse("ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16> ~ Char>").unwrap(),
+    });
+
+    fn print_subst(m: &std::collections::HashMap<TypeID, TypeTerm>, dict: &mut impl TypeDict) {
+        eprintln!("{{");
+
+        for (k,v) in m.iter() {
+            eprintln!("    {} --> {}",
+                dict.get_typename(k).unwrap(),
+                dict.unparse(v)
+            );
+        }
+
+        eprintln!("}}");
+    }
+
+    if let Some(path) = path.as_ref() {
+        for n in path.iter() {
+            eprintln!("
+ψ = {}
+morph {}
+  --> {}
+with
+            ",
+            n.halo.clone().sugar(&mut dict).pretty(&mut dict, 0),
+            n.m.get_type().src_type.sugar(&mut dict).pretty(&mut dict, 0),
+            n.m.get_type().dst_type.sugar(&mut dict).pretty(&mut dict, 0),
+            );
+            print_subst(&n.σ, &mut dict)
+        }
+    }
+
     assert_eq!(
-        base.find_morphism_path(MorphismType {
-            src_type: dict.parse("ℕ ~ <PosInt 10 BigEndian> ~ <Seq <Digit 10> ~ Char>").unwrap(),
-            dst_type: dict.parse("ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16> ~ Char>").unwrap()
-        }),
+        path,
         Some(
             vec![
-                dict.parse("ℕ ~ <PosInt 10 BigEndian> ~ <Seq <Digit 10> ~ Char>").unwrap().normalize(),
-                dict.parse("ℕ ~ <PosInt 10 BigEndian> ~ <Seq <Digit 10> ~ ℤ_2^64 ~ machine.UInt64>").unwrap().normalize(),
-                dict.parse("ℕ ~ <PosInt 10 LittleEndian> ~ <Seq <Digit 10> ~ ℤ_2^64 ~ machine.UInt64>").unwrap().normalize(),
-                dict.parse("ℕ ~ <PosInt 16 LittleEndian> ~ <Seq <Digit 16> ~ ℤ_2^64 ~ machine.UInt64>").unwrap().normalize(),
-                dict.parse("ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16> ~ ℤ_2^64 ~ machine.UInt64>").unwrap().normalize(),
-                dict.parse("ℕ ~ <PosInt 16 BigEndian> ~ <Seq <Digit 16> ~ Char>").unwrap().normalize(),
+                MorphismInstance {
+                    σ: vec![
+                        (dict.get_typeid(&"Radix".into()).unwrap(), TypeTerm::Num(10)),
+                        (dict.get_typeid(&"SrcRadix".into()).unwrap(), TypeTerm::Num(10)),
+                        (dict.get_typeid(&"DstRadix".into()).unwrap(), TypeTerm::Num(16))
+                    ].into_iter().collect(),
+                    halo: dict.parse("ℕ ~ <PosInt 10 BigEndian>").unwrap(),
+                    m: DummyMorphism(MorphismType {
+                        src_type: dict.parse("<Seq <Digit Radix> ~ Char>").unwrap(),
+                        dst_type: dict.parse("<Seq <Digit Radix> ~ ℤ_2^64 ~ machine.UInt64>").unwrap()
+                    }),
+                },
+                MorphismInstance {
+                    σ: vec![
+                        (dict.get_typeid(&"Radix".into()).unwrap(), TypeTerm::Num(10)),
+                        (dict.get_typeid(&"SrcRadix".into()).unwrap(), TypeTerm::Num(10)),
+                        (dict.get_typeid(&"DstRadix".into()).unwrap(), TypeTerm::Num(16))
+                    ].into_iter().collect(),
+                    halo: TypeTerm::unit(),
+                    m: DummyMorphism(MorphismType{
+                        src_type: dict.parse("ℕ ~ <PosInt Radix BigEndian> ~ <Seq <Digit Radix> ~ ℤ_2^64 ~ machine.UInt64>").unwrap(),
+                        dst_type: dict.parse("ℕ ~ <PosInt Radix LittleEndian> ~ <Seq <Digit Radix> ~ ℤ_2^64 ~ machine.UInt64>").unwrap()
+                    }),
+                },
+                MorphismInstance {
+                    σ: vec![
+                        (dict.get_typeid(&"SrcRadix".into()).unwrap(), TypeTerm::Num(10)),
+                        (dict.get_typeid(&"DstRadix".into()).unwrap(), TypeTerm::Num(16)),
+                        (dict.get_typeid(&"Radix".into()).unwrap(), TypeTerm::Num(16)),
+                    ].into_iter().collect(),
+                    halo: TypeTerm::unit(),
+                    m: DummyMorphism(MorphismType{
+                        src_type: dict.parse("ℕ ~ <PosInt SrcRadix LittleEndian> ~ <Seq <Digit SrcRadix> ~ ℤ_2^64 ~ machine.UInt64>").unwrap(),
+                        dst_type: dict.parse("ℕ ~ <PosInt DstRadix LittleEndian> ~ <Seq <Digit DstRadix> ~ ℤ_2^64 ~ machine.UInt64>").unwrap()
+                    }),
+                },
+                MorphismInstance {
+                    σ: vec![
+                        (dict.get_typeid(&"Radix".into()).unwrap(), TypeTerm::Num(16)),
+                        (dict.get_typeid(&"DstRadix".into()).unwrap(), TypeTerm::Num(16))
+                    ].into_iter().collect(),
+                    halo: TypeTerm::unit(),
+                    m: DummyMorphism(MorphismType{
+                        src_type: dict.parse("ℕ ~ <PosInt Radix LittleEndian> ~ <Seq <Digit Radix> ~ ℤ_2^64 ~ machine.UInt64>").unwrap(),
+                        dst_type: dict.parse("ℕ ~ <PosInt Radix BigEndian> ~ <Seq <Digit Radix> ~ ℤ_2^64 ~ machine.UInt64>").unwrap(),
+                    }),
+                },
+                MorphismInstance {
+                    σ: vec![
+                        (dict.get_typeid(&"Radix".into()).unwrap(), TypeTerm::Num(16))
+                    ].into_iter().collect(),
+                    halo: dict.parse("ℕ ~ <PosInt Radix BigEndian>").unwrap(),
+                    m: DummyMorphism(MorphismType{
+                        src_type: dict.parse("<Seq <Digit Radix> ~ ℤ_2^64 ~ machine.UInt64>").unwrap(),
+                        dst_type: dict.parse("<Seq <Digit Radix> ~ Char>").unwrap()
+                    })
+                }
             ]
         )
     );
-
+/*
     assert_eq!(
         base.find_morphism_path(MorphismType {
             src_type: dict.parse("Symbol ~ ℕ ~ <PosInt 10 BigEndian> ~ <Seq <Digit 10> ~ Char>").unwrap(),
@@ -106,7 +188,10 @@ fn test_morphism_path() {
             ]
         )
     );
+    */
 
+
+/*
     assert_eq!(
         base.find_morphism_with_subtyping(
             &MorphismType {
@@ -129,8 +214,9 @@ fn test_morphism_path() {
                 ].into_iter().collect::<std::collections::HashMap<TypeID, TypeTerm>>()
         ))
     );
+    */
 }
-
+/*
 #[test]
 fn test_steiner_tree() {
     let (mut dict, mut base) = morphism_test_setup();
@@ -158,3 +244,4 @@ fn test_steiner_tree() {
         eprintln!("no solution");
     }
 }
+*/