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static Rat ai_relationSymmetryCount(S rel) { L l = triplesWithB(rel); new Set> pairs; int i = 0, n = 0; for (TripleWeb w : l) pairs.add(stdCasePair(w.a, w.b)); for (TripleWeb w : l) { ++n; if (pairs.contains(stdCasePair(w.b, w.a))) ++i; } print("l(l)=" + l(l) + ", i=" + i +", n=" + n); ret rat(i, n); }