From the book
"Mathematical Puzzles of Sam Loyd"
Edited by Martin Gardner
From: Dover Publications in 1959
Show the route from
Philadelphia to Erie
passing once through
all the towns.
The map shows twenty-three
prominent cities of Pennsylvania
connected by bicycle
routs of more or less artistic design.
The problem is a
simple one: start on your summer outing
and go from Philadelphia
to Erie, passing once through every
one of the cities
and without going over any road twice.
That is all there
is to it.
The cities are numbered
to enable solvers to describe their
routes by a sequence
of figures. In this trip the usual
practice of getting
there by the "shortest route possible"
will be dispensed
with. Just get there, without minding