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Proof step 7 from proof abs-nodes-inv-flashsize-h (previous step)

⊦ abs-nodes(buf, m, gnd ' + gndx, lax, weak) ↔ (∃ buf0, buf1. buf = buf0 + buf1 ∧ ( abs-padding(buf0) ∧ abs-nodes(buf1, m + # buf0, gnd ' + gndx, lax, weak) ∨ lax ≠ [] ∧ lax.head.off = m ∧ lax.head.size = # buf0 ∧ abs-node(buf0, gnd) ∧ abs-nodes(buf1, m + # buf0, gndx, lax.tail, weak)))

A spec-lemma