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S = { 1,2,3,4,...,12 }
K = { 1,3,5,7,9,11 }
L = { 2,3,5,7,11 }
n(K) - n(L) = 6 - 5 = 1

S=(1,2,3,4,...,12)
K=(1,3,5,7,9,11)
L=(2,3,5,7,11)
n(k)-n(L)=6-5=1