Three of the following four letter-clusters are alike in a certain way and one is different.
Pick the odd one out.
Sum of alphabeticals order,
AVZ = 1+22+26=49
UPF = 21+16+6=43
EZV = 5+26+22=53
OKL = 15+11+12=38
OKL sum is even numbers and rest are odd numbers.
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