Possible max skill id_num in Hall of Forms

[Banpei-kun]

If we use an XOR cipher of DD 1A 64 8C for the unknown field of Hall of Forms structure, we get:

id_tag	Original value	XORed value	possible meaning
201910	2355371074	1695	second skill id_num of the old 91_dance02
201912	2355371057	1772	last skill id_num of the old 942_legend22
202002	2355371392	1885	second skill id_num of 200101_seisen
202003	2355371354	1927	second skill id_num of 200201_valentine
202004	2355371373	1968	last skill id_num of 200203_legend
202005	2355371271	2010	last skill id_num of 200303_legend
202006	2355371299	2046	last skill id_num of 200403_legend
202007	2355368703	2082	last skill id_num of 200503_legend
202008	2355368589	2128	last skill id_num of 200603_legend
202009	2355368623	2162	last skill id_num of 200703_legend

(Sorry, I'm too lazy to make them all links, so I only linkified the last one)

This could be a way to specify which skills can be offered to forma units during a Hall of Forms event.

In the 3 cases where it doesn't match the last skill id_num added on some month, it matches the second skill added in the following month. In these cases, the first few skills are either new PRFs or PRF refine skills, so they're never inheritable (i.e. they're functionally the same as specifying the last id_num of the previous month).

I confess I haven't seen a good analysis of which skills were available in each HoF, but I do remember some people got at least Joint Drive Spd (added in 200601_kakusei) in the last one (202008), which would at least be consistent with the above.