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| branch-node incidence matrix | |||
| associated matrix | |||
| incidence matrix | |||
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关 联矩阵 : 19 phrases in 7 subjects |
| Business | 3 |
| Electric machinery | 5 |
| Electronics | 3 |
| Rail transport | 1 |
| Securities | 1 |
| Space | 1 |
| Technology | 5 |
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