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Proof step 2 from proof reachable-n-rec-rev (previous step)

reachable-n(H, n, r, r0), m < n ⊦ ∃ r1. reachable-n(H, m, r, r1) ∧ reachable-n(H, n - m, r1, r0)

Lemma reach-n-split