From this table it is clear that

1st period
1st period	Ea1-10	Ea1-11	Ea1-12
2nd period
2nd period	Ea1-18	Ea1-19	Ea1-20
3rd period
3rd period	Ea1-28	Ea1-29
4th period
4th period	Ea2-7	Ea2-8	Ea2-9
5th period
5th period	Ea2-18	Ea2-19	Ea2-20
6th period
6th period	Ea2-29	Ea2-30
7th period
7th period	Ea3-7	Ea3-8
8th period
8th period	Ea3-25	Ea3-26

I have excluded period no. 9 because the structure there is somewhat different. Furthermore there are 20 glyphs above in the table, which indicates a kind of completeness.