??????
    --------
LXY ) PEYHLN
     -YLU
      ===
      LTWH
     -NUWW
      ====
        UPL
       -PYH
        ===
        NNYN
       -NNNL
        ====
        ????

base: 11
symbols: EHLMNPTUWXY
difficulty: hard
missing: M