cccc ccnc ccnr ccoc ccrc cnco cnnz cnrc cnrr coco con- conc conn cono coon cor- corc corn coro corr cozz crcc crcr crcz croc cron croo cror croz czon nccc nccn nccr ncnc ncoc ncor ncrc nnnn noco non- nonn nono noo- noon nooo noor nor- norc norn noro norr nroc nron nrrc nzcc occc occn ocon ocro ocrr onc- onco onno onon onor onoz onzo oocr oooo orco ornc orno oro- oron oror oroz orro orzo ozon rccc rcnr rcon rnco rocc roco ronc rono roon roor rooz rorc roro rozz rrrr z-ro zoco zon- zoo- zoon zorc zorn zoro zozo zzzz