C11111211113313112113313331333133313331333132311233133313231333221   >>    C1111121111331311211331333133313331333133313231123313331323133322   <<    C11111211113313112113313331333133313331333132311233133313231333223   >>      C11111211113313112113313331333133313331333132311233133313231333222   >>