sezione anno	A	B	C	D	E	F
50/51
51/52				IV
52/53
53/54			IV-III	I
54/55			IV-V		IV-V
55/56	IV-III	III	IV-V	I-III	V
56/57	V		V-I-II	II-III	II
57/58	I-III		IV-II-III		IV-III
58/59	IV-II	I	V-II-III	III	V
59/60	V-III	V	IV-I-III		IV-V