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| PHIT | PHIV | PHL | PHLA | PHLS | PHM |
| PHN | PHO | PHOS | PHP | PHPH | PHPU |
| PHQ | PHR | PHR(s) | PHRU | PHS | PHSO |
| PHSP | PHSS | PHT | PHTLS | PHTN | PHV |
| PHW | PHWG | PHX | PHY | PI | PI3 |
| PI3K | PIA | PIAG | PIAPHP | PIAQ | PIB |
| PIC | PICA | PICC | PICK | PICO | PICS |
| PICS XX | PICU | PID | PIE | PIF | pig/pigm |
| PIH | PIHB | PiHKAL | PIJAC | PIKB | PIKE |
| PIKR | PIL | PILB | PILD | PILE | PILO |
| PIM | PIMS | PIN | PIND | PING | PIOD |
| PIOS | PIP | PIPJ | PIR | PIRO | PIV |
| PIVAG | PIVOT | PIW | PJ | pJAK | PJC |
| PJS | PK | PK/PD | PKA | PKB | PKC |
| PKD | PKI | PKIA | PKIB | PKMB | PKN |
| PKP | PKR | PKU | PKY | PL | PLAB part 1 XX |
| PLAB part 2 XX | plat | PLB | PLCO | PLCV | PLD |