C11111211113313112113313331333133313331333132322121111331323133313232213131   >>    C1111121111331311211331333133313331333133313232212111133132313331323221313   <<    C11111211113313112113313331333133313331333132322121111331323133313232213133   >>      C11111211113313112113313331333133313331333132322121111331323133313232213132   >>