Preprocessor-Directive: one of

CATSTR      COMMENT     ELSE        ELSEIF
ELSEIF1     ELSEIF2     ELSEIFB     ELSEIFDEF
ELSEIFDIF   ELSEIFDIFI  ELSEIFE     ELSEIFIDN
ELSEIFIDNI  ELSEIFNB    ELSEIFNDEF  ENDIF
ENDM        EQU         EXITM       FOR
FORC        IF          IF1         IF2
IFB         IFDEF       IFDIF       IFDIFI
IFE         IFIDN       IFIDNI      IFNB
IFNDEF      INCLUDE     INSTR       IRP
IRPC        LOCAL       MACRO       PURGE
REPEAT      REPT        SIZESTR     SUBSTR