C11111211113313112113313331333131133133313331333132213233232321   >>    C1111121111331311211331333133313113313331333133313221323323232   <<    C11111211113313112113313331333131133133313331333132213233232323   >>      C11111211113313112113313331333131133133313331333132213233232322   >>