- "The full labyrinth description is given in (04-lines.txt). The labyrinth has 26 lines, labelled 0 to 25 inclusive. If you and 25 friends, labelled `a` to `z` in order, entered the labyrinth, in what order would you come out?\n",
+ "The full labyrinth description is given in [04-lines.txt](04-lines.txt). The labyrinth has 26 lines, labelled 0 to 25 inclusive. If you and 25 friends, labelled `a` to `z` in order, entered the labyrinth, in what order would you come out?\n",