C1111233131211111211113313331333132313231323223313232212132313221   >>    C111123313121111121111331333133313231323132322331323221213231322   <<    C1111233131211111211113313331333132313231323223313232212132313223   >>      C1111233131211111211113313331333132313231323223313232212132313222   >>