C1111233131211111211113313331333133313232321333133313231123313231221   >>    C111123313121111121111331333133313331323232133313331323112331323122   <<    C1111233131211111211113313331333133313232321333133313231123313231223   >>      C1111233131211111211113313331333133313232321333133313231123313231222   >>