User:CompactStar/Letter comma notation

VERY WIP (I'll move it to the main namespace if it's finished.)

The letter comma notation (LCN) is a notation scheme developed by CompactStar for just intonation up to the 31-limit as well as regular temperaments based on it. As with other JI notations, it is based on 3-limit notation with a set of accidentals corresponding to a formal comma for each prime limit. The letters H-Z are used for these accidentals, and alternate between ascending and descending, so H is 5-limit ascending, I is 5-limit descending, J is 7-limit ascending, K is 7-limit descending and so on. This notation bears similarity to FJS but it aims to be more easily typable.

Full list of formal commas

Prime limit	Letter	Comma	Letter	Comma
5	H	81/80	I	80/81
7	J	64/63	K	63/64
11	L	33/32	M	32/33
13	N	1053/1024	O	1024/1053
17	P	4131/4096	Q	4096/4131
19	R	513/512	S	512/513
23	T	736/729	U	729/736
29	V	261/256	W	256/261
31	X	32/31	Y	31/32

For example, 5/4 is IM3 and 7/4 is Km7