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

1. Alph: Type
2. L: Alph*Prop
3. l: Alph*
4. i: {0...||l||}
5. (l[0..i]) = nil
6. L(l[i..||l||])
7. i-0 = 0

L(l)

By: Assert (i = 0)

Generated subgoals:

1 i = 0
28. i = 0
L(l)


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functionlistpropnilsubtract