C1111233131211111211113313331333133313231333112211232322331333232321   >>    C111123313121111121111331333133313331323133311221123232233133323232   <<    C1111233131211111211113313331333133313231333112211232322331333232323   >>      C1111233131211111211113313331333133313231333112211232322331333232322   >>