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At: lang prod sing 1 1 2

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

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

By: Witness ||l||

Generated subgoals:

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


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