{Glyph CC} and {glyph CR} are provided as shorthand. Both of these are major glyphs.

{Glyph EE} and {glyph ZZ} are provided as a sensible extension of the {glyph CC} shorthand. Note that these are not read as TCC or TTCC. Since {glyph EE} is the T-type of glyph CC, it is forbidden to stack {glyph T} atop {glyph CC}. (Glyph EE and glyph ZZ are both column glyphs, so any stacking with them is forbidden.)

Glyph ER (TODO ADD) and {glyph ZR} are provided as a sensible extension of {glyph CR}. Likewise, glyph ER is the T-type of {glyph CR} so "T-CR" is forbidden. ({Glyph ZR} is provided for consistency, but I have yet to come across a situation where I would need to use it.)

{Glyph IN} is provided as shorthand (the {glyph I} "shares" a vertical line with {glyph _N}). {Glyph ING} is provided as shorthand. Both of these are low glyphs, so they have restrictions similar to {glyph _N}.