Fix MyFiniteSetDisjointUnion

1 files changed, 3 insertions, 3 deletions

diff --git a/src/act4e_solutions/sets_sum.py b/src/act4e_solutions/sets_sum.py
index f36cec1..19f1969 100644
--- a/src/act4e_solutions/sets_sum.py
+++ b/src/act4e_solutions/sets_sum.py
@@ -4,7 +4,7 @@ import act4e_interfaces as I
 
 X = TypeVar("X")
 C = TypeVar("C")
-E = Tuple[int, C]
+E = List # Tuple[int, C] 
 
 class MyFiniteSetDisjointUnion(I.FiniteSetDisjointUnion[C, E]):
     _components: List[I.FiniteSet[C]]
@@ -28,7 +28,7 @@ class MyFiniteSetDisjointUnion(I.FiniteSetDisjointUnion[C, E]):
         es = []
         for i, c in enumerate(self._components):
             for e in c.elements():
-                es.append((i, e))
+                es.append([i, e])
 
         return es
 
@@ -42,7 +42,7 @@ class MyFiniteSetDisjointUnion(I.FiniteSetDisjointUnion[C, E]):
         if not self._components[i].contains(e):
             raise I.InvalidValue
 
-        return (i, e)
+        return [i, e]
 
     def unpack(self, e: E) -> Tuple[int, C]:
         return tuple(e)