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{ }
{a}, {b}, {c}, {d}
{a,b}, {a,c}, {a,d}, {b,c}, {b,d}, {c,d}
{a,b,c}, {a,b,d}, {a,c,d}, {b,c,d}
{a,b,c,d}
Ada 16
3 anggota = {a,b,c} {b,c,d} = 2 anngota..
aku minta mmaaff kalo salah