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1
1 2 1
1 3 3 1
a cuma dapet dua yaitu { a,b } { b,a }
b j cuma tiga dapet tiga yaitu { 2,3,5 } {3,5,2 } { 5,3,2 }
b. {} {2} {3} {5} {23} {25} {35}
semoga benar.