C1111233131211111211113313331323133313231333133211113313231232213221   >>    C111123313121111121111331333132313331323133313321111331323123221322   <<    C1111233131211111211113313331323133313231333133211113313231232213223   >>      C1111233131211111211113313331323133313231333133211113313231232213222   >>