Henry Ernest Dudeney/Puzzles and Curious Problems/263 - Footprints in the Snow

by : $263$

 * Footprints in the Snow
 * Four schoolboys, living respectively in the houses $A$, $B$, $C$, and $D$, attended different schools.
 * After a snowstorm one morning their footprints were examined, and it was found that no boy had ever crossed the track of another boy,
 * or gone outside the square boundary.


 * Dudeney-Puzzles-and-Curious-Problems-263.png


 * Take your pencil and continue their tracks, so that the boy $A$ goes to the school $A$, the boy $B$ to the school $B$, and so on,
 * without any line crossing another line.