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Proof step 1 from proof valid-journal-head-valid-group-nodes (conclusion)

⊦ valid-journal-head(nx, gstore, ginval) ∧ nx ≠ [] ∧ gstore[nx.last] = groupblock(gndx, lax, lnum) → valid-group-nodes(gndx) = # gndx

System applied rule normalize

And obtained the following new goals

Rule argument

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