????????
      +---------
PHRGN | RUFYFQWE
       -EGJGY
        =====
         EFMEQ
        -EGJGY
         =====
          QMQGW
         -HRNHR
          =====
           WFPFE
          -MMGUP
           =====
           ?????

base: 13
letters: EFGHJMNPQRUWY
difficulty: medium