anchor.diff:          enddo
          enddo
         enddo
  -      else
  +      else ! if (n.eq.1) then
         do j2 = 1,b
          id(2) = j2
          do j3 = 1,c
  
positive.code:         enddo
         enddo
        enddo
        else
        do j2 = 1,b
         id(2) = j2
         do j3 = 1,c
  
negative.code:         enddo
         enddo
        enddo
        else ! if (l.eq.1) then
        do j2 = 1,b
         id(2) = j2
         do j3 = 1,c
  