data/advent12.txt

   1 by-TW
   2 start-TW
   3 fw-end
   4 QZ-end
   5 JH-by
   6 ka-start
   7 ka-by
   8 end-JH
   9 QZ-cv
  10 vg-TI
  11 by-fw
  12 QZ-by
  13 JH-ka
  14 JH-vg
  15 vg-fw
  16 TW-cv
  17 QZ-vg
  18 ka-TW
  19 ka-QZ
  20 JH-fw
  21 vg-hu
  22 cv-start
  23 by-cv
  24 ka-cv