Match the columns:
| Column I | Column II |
| P. S. aureus | 1. Gram-negative rod-shaped bacteria |
| Q. L. monocytogenes | 2. Gram-negative spiral bacteria |
| R. B. pertussis | 3. Gram-positive coccus-shaped bacteria |
| S. T. pallidum | 4. Gram-positive rod-shaped bacteria |
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