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At: en inj 1 2
1. n:
2. m:
3. 0 < m
4. l1,l2:n*. ||l1|| = m-1 & ||l2|| = m-1 en(l1) = en(l2) l1 = l2

l1,l2:n*. ||l1|| = m & ||l2|| = m en(l1) = en(l2) l1 = l2
By:
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THEN
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Generated subgoal:

15. l1: n*
6. l2: n*
||l1|| = m & ||l2|| = m en(l1) = en(l2) l1 = l2

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alllistnatural_numberimpliesand
equalintless_thansubtract