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At: lang prod sing 1

1. Alph: Type
2. L: Alph*Prop
3. l: Alph*

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

By: Reduce 0

Generated subgoal:

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


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