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static LPair streaksOfRepeatingElements(L l) { new LPair out; int i = 0, n = l(l); while (i < n) { A a = l.get(i); int j = i+1; while (j < n && eq(a, l.get(j)))) ++j; out.add(pair(intRange(i, j), a)); i = j; } ret out; }