永遠的友誼_友誼的傳遞屬性-溫馨介紹的重要性

永遠的友誼 Per Wikipedia, "In mathematics, a binary relation ... is transitive if ... element a is related to an element b and b is related to an element c then a is also related to c." 每維基百科，「在數學，一個二元關係..

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