For a pattern to escape its bounding box, it must have one of the following:
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B0, B1e, B1c, B2a, B2c, B3i
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B0, B1e, B1c, B2a, B2e, B3a
For lightspeed spaceships to exist, a rule needs one of the following:
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B0, B1e, B1c, B2a
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B0, B1e, B1c, B2a, B2c
B1c cannot support spaceships, unless B0 is present.
At least one death transition is required for spaceships or oscillators to exist.
If a pattern has XY symmetry, it cannot be a spaceship.
If a pattern has less than 3 cells, it must have XY symmetry.
If a pattern is smaller than 2x2, it must have XY symmetry.
All spaceships that are not diagonal or orthogonal must be asymmetrical.