C1111233131211111211113313331333133313331311132113313231333132313222312121   >>    C111123313121111121111331333133313331333131113211331323133313231322231212   <<    C1111233131211111211113313331333133313331311132113313231333132313222312123   >>      C1111233131211111211113313331333133313331311132113313231333132313222312122   >>