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At: lang sing prod 1 2 1 2 1 1 2

1. Alph: Type
2. L: Alph*Prop
3. l: Alph*
4. L(l)
5. ||l[0..0]|| = 0

(l[0..0]) = nil

By: Assert (m:Alph*. ||m|| = 0 m = nil)

Generated subgoals:

1 m:Alph*. ||m|| = 0 m = nil
26. m:Alph*. ||m|| = 0 m = nil
(l[0..0]) = nil


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