Repetitio est mater studiorum

Start 1 - the beginning of growth for cycle 1
Start 1-1 - start of decline for cycle 1
Middle point and minimum of cycle 1 after 620 days of 1-1 (equal with Start 1)
End 1 (Start 2) and of cycle 1 return to start value after 1340 days and the beginning of growth for cycle 2
Start 2-2 - start of decline for cycle 2
What is next ?
Repetitio est mater studiorum !
Minimum after 620 days equal with Start 2
Return to 2-2 after 1340 days