First of all, see the pattern
JE , OJ, SO, VT
The second alphabet of every element is increasing by 5.
Check E + 5 = J, J +5 = O, O +5 = T, and consequently T +5 =Y
The first alphabet is increasing with decreasing order from 5.
J + 5= O, O +4 = S, S +3 =V and consequently, V+2 = X
So the element becomes XY.
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