C312312111111331312111133132313331333133313111211113313223313231221   >>    C31231211111133131211113313231333133313331311121111331322331323122   <<    C312312111111331312111133132313331333133313111211113313223313231223   >>      C312312111111331312111133132313331333133313111211113313223313231222   >>