???????M
      +---------
LLXRM | WPLMXQRP
       -WNURQW
        ======
         RMYQLR
        -RNQXMQ
         ======
          LWULNP
         -WMYRYR
          ======
          ??????

base: 10
letters: LMNPQRUWXY
difficulty: medium