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At: lang union idemp

Alph:Type, L:LangOver(Alph). (L U L) = L
By:
Unfold `languages` 0
THEN
Unfold `lang_eq` 0
THEN
Unfold `lang_union` 0
THEN
Reduce 0
THEN
UnivCD
Generated subgoal:

11. Alph: Type
2. L: Alph*Prop
3. l: Alph*
L(l) L(l) L(l)

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