HCA
      +--------
HXCGH | XULWCXW
       -WWHCU
        =====
        LAAPHX
       -LCWXPH
        ======
         HGLGWW
        -HHLFWC
         ======
          LFHPP

base: 10
letters: ACFGHLPUWX
difficulty: intermediate
restrictions: no multiplication