C21221212121211331313233313131133132333132313223313231323231321   >>    C2122121212121133131323331313113313233313231322331323132323132   <<    C21221212121211331313233313131133132333132313223313231323231323   >>      C21221212121211331313233313131133132333132313223313231323231322   >>