C11112331333132311331333133313331323132313331211111211111232322331333132311211   >>    C1111233133313231133133313331333132313231333121111121111123232233133313231121   <<    C11112331333132311331333133313331323132313331211111211111232322331333132311213   >>      C11112331333132311331333133313331323132313331211111211111232322331333132311212   >>