Example 4 SORTIN01-03 DD statements (merge)

//SORTIN01 DD  DSNAME=MERGE1,VOLUME=SER=000111,DISP=OLD,
//             LABEL=(,NL),UNIT=3590,
//             DCB=(RECFM=FB,LRECL=80,BLKSIZE=32000)
//SORTIN02 DD  DSNAME=MERGE2,VOLUME=SER=000121,DISP=OLD,
//             LABEL=(,NL),UNIT=3590,
//             DCB=(RECFM=FB,LRECL=80,BLKSIZE=32000)
//SORTIN03 DD  DSNAME=MERGE3,VOLUME=SER=000131,DISP=OLD,
//             LABEL=(,NL),UNIT=3590,
//             DCB=(RECFM=FB,LRECL=80,BLKSIZE=32000)