Diagonal sawtooth with expansion factor 4
Population is unbounded but does not tend to infinity. Its graph
is a sawtooth function with ever-increasing teeth.
A p960 gun sends gliders southwest. Some are deleted; the others
reflect off the back of a Cordership. Each returning glider
deletes 2 outgoing ones.
Note the use of an in-line inverter found by David Bell.
This was built by David Bell 8/29/92
(header written by Dean Hickerson)
