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At: con free g wf 1 1 1 1

1. V: Type
2. T: Type
3. G: Grammar(V;T)
4. i: ||G.prod||
5. a: V
6. ||[inl(a)]|| = ||nil||+1

||nil||+1 > 0

By: Assert (||nil|| = 0)

Generated subgoals:

1 ||nil|| = 0
27. ||nil|| = 0
||nil||+1 > 0


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