John Conway's Game of Life

Thin rake

By Dean Hickerson and Paul Callahan.

This example of a thin rake starts with a period-120 block puffer
(Callahan's design using p24 and p20 rakes) and uses three halving
stages, resulting in the rather large period of 960.

See also RAKE, RAKE2, MWSSRAKE, MWSSRAK2.