 rung
          30,   60,   0,
          67,   60,  30,
          30,   60,  30,
          30,   60,   0,
          67,   60,   0,
          67,   60,  30,

          // right of middle rung
          67,   60,   0,
          67,   90,  30,
          67,   60,  30,
          67,   60,   0,
          67,   90,   0,
          67,   90,  30,

          // bottom of middle rung.
          30,   90,   0,
          30,   90,  30,
          67,   90,  30,
          30,   90,   0,
          67,   90,  30,
         