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| Subject | English | Thesaurus |
| IT, abbr. | Operating System / Primary Control Program | OSPCP (IBM, OS, OS/360, Vorlaeufer) |
| IT, abbr. | Operating System / Primary Control Program | OS/PCP (IBM, OS, OS/360, Vorlaeufer) |
| med., abbr. | Primary Care Provider Incentive Program | PCPIP |
| IT, abbr. | Primary Control Program | PCP (IBM, OS, OS/PCP) |
| ed., abbr. | Primary Enrichment Program | PEP |
| law, abbr. | Primary Intervention Program | PIP |
| ed., abbr. | Primary Years Program | PYP |