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Match the industrial products mentioned in Group I with their producer organisms in Group II.
| Group I | Group II |
| P. Citric acid | 1. Trichoderma viride |
| Q. Cellulase | 2. Clostridium acetobutylicum |
| R. Vitamin B12 | 3. Aspergillus niger |
| S. Butanol | 4. Propionibacterium freudenreichii |
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