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At: length sublist 1

1. T : Type
2. L1 : T List
3. L2 : T List
4. f : ||L1||||L2||
5. increasing(f;||L1||)
6. j:||L1||. L1[j] = L2[(f(j))]
  ||L1||||L2||


By: BackThru Thm* k,m:. (f:(km). increasing(f;k))  km
THEN
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