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OpenStudy (anonymous):
Did I express this statement right? Every student has chated with at least 1 other student in at least 1 chat group? ∀(xϵS) ∃(yϵS) ∃(zϵG) [ x≠y Λ P(x,y,z) ] where S is the set of students and G is the set of chat group?
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OpenStudy (anonymous):
Can I just take the S and G and say let x,y be a student and z be a chat group?
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