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yyyy 1 2 3 4 5 6 7 8 9 z 1 2 zero 1 2 3 4 5 zone 1 2 3 4 5 6 7 8 9 10 zones 1 2 3 4 5 { 1 2 | 1 2 3 } 1 2 ~ 1 2 3 4 © × – 1 2 ← 1 2 → 1 2 √ 1 2 ≤ 1 2 3 4