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| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1-Spread | 1 |
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| 2-Attitude of the bid | 0.290 | 1 |
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| 3-Relative size | 0.299 | 0.339 | 1 |
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| 4-Payment method | −0.219 | −0.113 | −0.420 | 1 |
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