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4a1
Hb4-24
Hb4-25
Hb4-26
Hb4-27
Hb4-28
Hb4-29
Hb4-30
4a2
Hb4-31
Hb4-32
Hb4-33
Hb4-34
Hb4-35
Hb4-36
Hb4-37
Hb4-38
3a1
3a2
3a3
The 'periods' are sorted so that the one we study comes first. After that comes the earlier 'periods', going backwards.
But each of these earlier 'periods' are sorted in the order a, b, c (not backwards).
3b
3c
2a1
2a2a
2a2b
2a2c
2b
2c
1a
1b
1c
