C21221212121211331313233313131133132333132313223313231323221123313221   >>    C2122121212121133131323331313113313233313231322331323132322112331322   <<    C21221212121211331313233313131133132333132313223313231323221123313223   >>      C21221212121211331313233313131133132333132313223313231323221123313222   >>