Discrete mathematics - Training Enrollment Network

Discrete mathematics

R(R)= { & lt； a，b & gt，& ltb，c & gt，& ltc，a & gt，& lta，a & gt，& ltb，b & gt，& ltc，c & gt};

s(R)= { & lt； a，b & gt，& ltb，a & gt，& ltb，c & gt，& ltc，b & gt，& ltc，a & gt，& lta，c & gt};

t(R)= { & lt； a，b & gt，& ltb，c & gt，& ltc，a & gt，& lta，c & gt，& lta，a & gt，& ltc，c & gt，& ltb，a & gt，& ltb，b & gt，& ltc，b & gt}

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