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At: nth tl lem0 2

1. T: Type
2. y:
3. 0 < y
4. as:T*. tl(nth_tl(y-1;as)) = nth_tl(y-1+1;as)

as:T*. tl(nth_tl(y;as)) = nth_tl(y+1;as)

By: RecCaseSplit `nth_tl`

Generated subgoal:

15. 0 < y
6. as: T*
tl(nth_tl(y-1;tl(as))) = nth_tl(y+1;as)


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