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static Pair> ai_dropCommonSuffixListCI_ifNonTrivial(Pair> p) { if (p == null) null; int n = l(commonSuffixListCI(p.a, p.b)); if (n == 0 || n == l(p.a) || n == l(p.b)) null; ret pair(takeFirst(n, p.a), takeFirst(n, p.b)); }