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static void verifyFunctionPairOnInput(O forward, O backward, O input) { O intermediate, output; if (!eq(input, output = callF(backward, intermediate = callF(forward, input)))) fail("Function is not a pair: input=" + sfu(input) + ", output=" + sfu(output) + ", f=" + forward + ", g=" + backward + ", intermediate=" + sfu(intermediate)); }