In the 7th period of the calendar of the year in G there is a tagata glyph without 'accessories' in form of extra signs and in the following two periods (8 and 9) more information is given about what season is 'fully grown':

 

Ga4-1	Ga4-2	Ga4-3	Ga4-4
7
Ga4-5	Ga4-6	Ga4-7	Ga4-8
8		9

The glyphs in period 7 refer backwards to three earlier periods (3 marks at bottom left on Ga4-2). If these three periods are 4, 5 and 6, we can reach a quartet (including period 7), and with autumn equinox arriving beyond a 2nd group of 8 periods a symmetrical structure would be: