???????
     +--------
NYNA | UXUYUAH
      -YACN
       ====
        MNMU
       -HMAY
        ====
         MNRA
        -HMAY
         ====
          HMMH
         -HMAY
          ====
          ????

base: 10
letters: ACEHMNRUXY
missing: E
difficulty: medium