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At: nth tl lem1


T:Type, x,y:, as:T*. nth_tl(x;nth_tl(y;as)) = nth_tl(x+y;as)

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11. T: Type
2. x:
y:, as:T*. nth_tl(x;nth_tl(y;as)) = nth_tl(x+y;as)


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