????????
      +---------
WGGLW | XQWWXXAX
       -WGGLW
        =====
        CPHPCX
       -CAXLTH
        ======
         GGPPXA
        -GHGTPQ
         ======
          GAQHGX
         -GHGTPQ
          ======
          ??????

base: 10
letters: ACGHLPQTWX
difficulty: easy