PJN
      +--------
TPWNJ | GNPTTGW
       -TPWNJ
        =====
        PCJPYG
       -PQCHHY
        ======
         JHJTCW
        -JTMMPH
         ======
          CYMJP

base: 12
letters: CGHJMNPQRTWY
difficulty: medium
missing: R