fflip     headr
     )00       mn   )02        We cannot simply do
               mn                sbr  )04,)02-2  because
               sar  )04            )02 might have an index
               sbr  )03, )0a
     )0k       mcw  0&)03,)0l#1
               sar  )03
               bce  )0m, )0l, )0g
               bce  )0m, )0l, )0h
               bce  )0m, )0l, )0i
               bce  )0m, )0l, )1?
               bce  )0m, )0l, ,                             )0i)1?)0x)0y
               bw   )0m, 1&)03                                    )0v)0f
               mcw  )0l, 2&)04
               sbr  )04
               bw   )0m, 1&)03                                    )0e)0f
               b    )0k
     )0m       equ  *&1