Nonomino switch engine predecessor

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Nonomino switch engine predecessor is the unique nonomino (a polyomino having 9 cells) whose evolution results in a switch engine. It is the smallest polyomino to do so.

Charles Corderman may have found this object in 1971 while exhaustively investigating the fate of all the small polyominoes. Records indicate that he found the switch engine while investigating the decominoes (polyominoes having 10 cells). However, there do not appear to be decominoes which result in a clean switch engine. If Corderman was examining polyominoes in order of size, then this smaller predecessor should have been found first in any case.

x = 6, y = 3, rule = B3/S23 3o$2bobo$2b4o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 Z 20 HEIGHT 480 GPS 1 AUTOSTART PAUSE 2 T 2 PAUSE 2 LOOP 3 ]]
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