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

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

||l[||l||..||l||]|| = 0

By: RWH (LemmaC Thm* as:T*, i:{0...||as||}, j:{i...||as||}. ||as[i..j]|| = j-i) 0

Generated subgoals:

1 0||l||
2 ||l||-||l|| = 0


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