????????
      ----------
TMTRX ) PUNQTWQY
       -TMTRX
        =====
        QTPTMW
       -QETQWL
        ======
         TQQTLQ
        -TEFTRW
         ======
           LYULY
          -XRMMM
           =====
           ?????

base: 13
symbols: EFLMNPQRTUWXY
difficulty: medium