In the following question, a set of letters is given. By what logic/rule/relationship does the letters of each group belong to the letters of the same group. Select one set of letters from the given alternatives following the same logic/rule/relation.
(EP, FR, GT)
1
(AF, BH, CJ)
2
(ZC, AE, BF)
3
(QS, RU, SX)
4
(JL, KM, LO)