Match the following locations with support types in coal mines.
| Location | Support type |
|---|---|
| P. Roadway junctions | 1. Powered support |
| Q. Between adjacent panels | 2. Chock and bolt |
| R. Longwall face | 3. Back fill |
| S. Goaf | 4. Barrier pillar |
P-2,Q-3,R-1,S-4
P-4,Q-3,R-1,S-2
P-2,Q-4,R-1,S-3
P-2,Q-3,R-4,S-1
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