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A Tight Bound for EMAC - CWI

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e an accident. And if we only consider structure graphs built by at most two<br />

paths, then also the second true collision is necessarily an accident (see Lemma<br />

10 in the full version of [BPR05], fact (i) below follows from this).<br />

For G ∈G(M) andi, j, 1≤ i

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