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At: lang sing prod 1 2 1

1. Alph: Type
2. L: Alph*Prop
3. l: Alph*
4. L(l)

i:{0...||l||}. null(l[0..i]) & L(l[i..||l||])

By: Witness 0

Generated subgoals:

1 0||l||
2 null(l[0..0]) & L(l[0..||l||])


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