*        Find the missing permutation - 19/10/2015
PERMMISX CSECT
         USING  PERMMISX,R15       set base register
         LA     R4,0               i=0
         LA     R6,1               step
         LA     R7,23              to
LOOPI    BXH    R4,R6,ELOOPI       do i=1 to hbound(perms)
         LA     R5,0               j=0
         LA     R8,1               step
         LA     R9,4               to
LOOPJ    BXH    R5,R8,ELOOPJ       do j=1 to hbound(miss)
         LR     R1,R4              i
         SLA    R1,2               *4
         LA     R3,PERMS-5(R1)     @perms(i)
         AR     R3,R5              j
         LA     R2,MISS-1(R5)      @miss(j)
         XC     0(1,R2),0(R3)      miss(j)=miss(j) xor substr(perms(i),j,1)
         B      LOOPJ
ELOOPJ   B      LOOPI
ELOOPI   XPRNT  MISS,15            print buffer
         XR     R15,R15            set return code
         BR     R14                return to caller
PERMS    DC     C'ABCD',C'CABD',C'ACDB',C'DACB',C'BCDA',C'ACBD'
         DC     C'ADCB',C'CDAB',C'DABC',C'BCAD',C'CADB',C'CDBA'
         DC     C'CBAD',C'ABDC',C'ADBC',C'BDCA',C'DCBA',C'BACD'
         DC     C'BADC',C'BDAC',C'CBDA',C'DBCA',C'DCAB'
MISS     DC     4XL1'00',C' is missing'  buffer
         YREGS
         END    PERMMISX