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At: leaf value wf
  E:Type, t:Tree(E). is_leaf(t)  leaf_value(t)  E
By: Unfold `leaf_value` 0 THEN MoveToConcl -1 THEN TreeInd -1
THEN
Unfold `is_leaf` 0
THEN
Reduce 0

Generated subgoals:

None

About:
assertuniversememberimpliesall
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