RNP
      +---------
FHFPW | EYRHUWFR
       -QWUUEQ
        ======
         QMQFMF
        -QEWQPN
         ======
          NNNYQR
         -NTMWFW
          ======
           EPQPP

base: 12
letters: EFHMNPQRTUWY
difficulty: medium