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x = 4, y = 3, rule = B3/S23 b3o$3o$bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
Pattern type Methuselah
Number of cells 7
Bounding box 4 × 3
Lifespan 148 generations
Final population 28
L/I 21.1
F/I 4
F/L 0.189
L/MCPS 21.1
Discovered by John Conway
Year of discovery 1970

The C-heptomino is a methuselah (by shifting the top-left cell of the B-heptomino one cell right) that evolves in the same way as a B-heptomino after its second generation and thus evolves into three blocks, two gliders and a ship after 148 generations. It was named by John Conway. Despite this, it can't be used with the BFx59H due to reacting in its predecessor form shown in the p54 shuttle.

Most B-heptomino sequences form from behind due to their c/2o mechanism, meaning that active parts of soups almost never reverse direction when they form. The C-heptomino is an exception, as it can form from any direction.

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