EVERY WAY TO GET A FAILSTATE WITH THESE MODS

INFINITE LOOP:
* 2D X IS 3D.
* X IS 3D + NOT 2D X IS NOT 3D.
* ALWAYS AND NEVER beginning.
* NOT ALWAYS AND NOT NEVER beginning.
* X SEENBY Y IS HIDE/PHANTOM/CLEAR.
* X COLOURED COLOURA IS COLOURB.
* X IMITATE X.
* Obvious syntax with the -ING infixes + COLOURED.
* X IS FILL AND CLEAR.
* A YOU object interacts with an INFINITE object.
* LEVEL IS INFINITE.

TOO COMPLEX:
* Use too many LETTER syntax to the point of too much parsing.
* A YOU object interacts with a COMPLEX object.
* LEVEL IS COMPLEX.

[DEPRECATED, NO LONGER EXISTS] INCOMPATIBLE STATEMENT/BAD ARTICLE (CUSTOM):
* Using GAME or SEEDING in rules which were not whitelisted (i.e. GAME IS YOU, SEEDING IS BIRD, etc.).
* Using ERROR (when it was a noun, before it was turned into a property) as a subject (before verb).
* Incorrect syntax with A/AN.

DIVIDED BY ZERO (CUSTOM):
* Use RARER to make a PSEUDO-prefix divide by zero.

MATH.HUGE (CUSTOM):
* Use NOT RARER to make a PSEUDO-prefix's numerator larger than the denominator.