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At: tl append front 1 2

1. T: Type
2. l: T*
3. m: T*
4. u: T
5. v: T*
6. ||v|| > 0 tl((v @ m)) = (tl(v) @ m)

||u.v|| > 0 tl(((u.v) @ m)) = (tl((u.v)) @ m)

By: Analyze 0

Generated subgoal:

17. ||u.v|| > 0
tl(((u.v) @ m)) = (tl((u.v)) @ m)


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