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1. T: Type
2. as: T*
3. i: {0...||as||}
4. j: {i...||as||}
5. k: {j...||as||}
6. x:
7. 0 < x
8. kx-1+i (firstn(x-1;nth_tl(i;as)) @ firstn(k-(x-1+i);nth_tl(x-1+i;as))) = firstn(k-i;nth_tl(i;as))

kx+i (firstn(x;nth_tl(i;as)) @ firstn(k-(x+i);nth_tl(x+i;as))) = firstn(k-i;nth_tl(i;as))

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THEN
Analyze 8


Generated subgoal:

18. kx+i
9. (firstn(x-1;nth_tl(i;as)) @ firstn(k-(x-1+i);nth_tl(x-1+i;as))) = firstn(k-i;nth_tl(i;as))
(firstn(x;nth_tl(i;as)) @ firstn(k-(x+i);nth_tl(x+i;as))) = firstn(k-i;nth_tl(i;as))


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