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1 | → | → | 2 |
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→ | → | 3 | → |
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4 | → | → | → |
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5 | 6 | → | → |
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→ | → | → | 7 |
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→ | → | → | → |
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→ | → | → | → |
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→ | → | → | → |
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→ | → | → | → |
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8 | → | 9 | 10 |
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→ | → | → | → |
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→ | → | → | 11 |
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→ | → | → | → |
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12 | 13 | → | → |
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→ | → | → | → |
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14 | 15 | → | → |
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16 | 17 | 18 | → |