(21/3 - 20/4)
(21/4 - 21/5)
(22/5 - 21/6)
(22/6 - 22/7)
(23/7 - 23/8)
(24/8 - 23/9)
(24/9 - 23/10)
(24/10 - 22/11)
(23/11 - 21/12)
(22/12 - 20/1)
(21/1 - 19/2)
(20/2 - 20/3)
