Select the letter-cluster that can replace the question mark (?) in the following series. QFF , SHH , UJJ , WLL ?

YNN NYY NYN YNY

YNN

The first letters are in alphabetical order with a letter skipped in between each segment:O,S,U,W, Y . The second and third letters are repeated; they are also in order with a skipped letter: F , H , J ,L , N