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    a1    a2    a3
t1    y    y    n
t2    y    n    y
t3    n    y    y
t4    y    y    n

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Subset(s)1 = {t1,t2}{t3}{t4}
Subset(s)2 = {t1}{t2,t3}{t4}
Subset(s)3 = {t1}{t2}{t3,t4}