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static L> combineZigZag(L l1, L l2) { int lA = l(l1), lB = l(l2), maxSum = max(lA, lB); L> out = new L; if (lA == 0 || lB == 0) ret out; for (int sum = 1; sum <= maxSum; sum++) { int maxA = min(lA, sum); for iA to maxA: if (sum-1-iA < lB) out.add(pair(l1.get(iA), l2.get(sum-1-iA))); } ret out; }