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At: lang inters idemp

Alph:Type, L:LangOver(Alph). (L L) = L
By:
Unfold `languages` 0
THEN
Unfold `lang_eq` 0
THEN
Unfold `lang_inters` 0
THEN
UnivCD
THEN
Reduce 0
THEN
ProveProp
Generated subgoals:

None

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