We have a little table to show the appearances of the ‘sitting shark’ in all 6 periods of this calendar. But now he is here in an ‘extra session'.

And we may also add yet another appearance, immediately before the start of the calendar (as I have earlier preliminary defined it):

H
P
Q

Maybe this means that we should start the calendar earlier and include the glyphs above? We can recognize the sun and the double-headed person too. I think we need to count glyphs to see if we will get some help to resolve this question.