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At: lang prod sing 1 1 1 1 1 1

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

L(l)

By: ApFunToHypEquands `x' ||x|| 6

Generated subgoals:

17. x: Alph*
||x|| = ||x||
27. ||l[i..||l||]|| = ||nil||
L(l)


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applyintuniversefunctionlist
propnatural_numberequalnil