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