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Match those listed in Group 1 with the NDT methods listed in Group 2.
Match those listed in Group 1 with the NDT methods listed in Group 2.
| Group 1 | Group 2 |
| P. Penetrameter | 1. Ultrasonic test |
| Q. Differential coil probe | 2. Dye-penetrant test |
| R. Piezo-electric probe | 3. X-ray radiography |
| S. Developer | 4. Accoustic emission test |
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