In the above pattern, there is a gun set up
to produce loop-lengthening spaceships, but it is
normally suppressed by a glider stream.
One incoming glider is included to suppress the
suppressing stream, thus
releasing a spaceship to lengthen the loop. Initial bit contents of the loop
are 01, based on a positive logic rightward stream.
When the loop is lengthened, the new contents
become 011 (a 1 is always what's inserted).
The output glider stream can be interpreted as as 010101011011011011...
That is, the loop is
lengthened after three full cycles.
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