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The term "eq_refl" has type
"muln (S (S O)) (S (S O)) = muln (S (S O)) (S (S O))"
while it is expected to have type
"muln (S (S O)) (S (S O)) = S (S (S (S O)))"
(cannot unify "muln (S (S O)) (S (S O))" and "S (S (S (S O)))”).
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