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If ' ' sign is assigned to beneficial interaction, ' ' sign to detrimental and ' ' sign to neutral interaction, then the population interaction represented by '+' '-' refers to
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Parasitism
| Name of interaction | Species A | Species B |
| Mutualism | + | + |
| Protocooperation | + | + |
| Amensalism | - | 0 |
| Commensalism | + | 0 |
| Competition | - | - |
| Parasitism | + | - |
| Predation | + | - |
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