C211111133131323223313233313231133132333132311221123231333112121   >>    C21111113313132322331323331323113313233313231122112323133311212   <<    C211111133131323223313233313231133132333132311221123231333112123   >>      C211111133131323223313233313231133132333132311221123231333112122   >>