prov:value
| - Each zone 2 and 3 consists of seven distinct groups or calendar years, the groups of years in zone 2 being designated A, B, C, D, E, F and G, and the seven groups of years in zone 3 being designated H, I, L, M, N, O and P. Other forms of markings or symbols can be used to identify the fourteen year groups of calendar section 1.
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