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Crane injury accident causation interaction matrix.
| X1 | X12 | X13 | … | Column i : The influence of other main factors on Xj on the main diagonal | |
| X21 | X2 | X23 | … | ||
| X31 | X32 | X3 | … | ||
| … | … | … | … | … | … |
| Row i : The influence of Xi on other main factors on the main diagonal | … | X15 | X15, 16 | ||
| … | X16, 15 | X16 | |||
