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| 1 | → | 2 | → |
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| → | → | → | 3 |
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| → | → | → | → |
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| → | → | → | → |
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| → | → | → | → |
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| → | → | 4 | → |
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| → | 5 | 6 | → |
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| → | → | → | → |
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| → | → | 7 | 8 |
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| 1 | → | 2 | → |
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| → | → | → | 3 |
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| → | → | → | → |
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| → | → | → | → |
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| → | → | → | → |
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| → | → | 4 | → |
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| → | 5 | 6 | → |
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| → | → | → | → |
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| → | → | 7 | 8 |
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