cccc cccs ccoc ccrc ccrs ccrt ccss ccst cctc cctt coco coct coos coot cor- corc coro corr cors cort cosc coso coss cost cotc coto cots cott crcc crcr croc croo cror crot crrt crss crst crtc crts cscc csco cscr cscs csor csos csot csrc csrs cssr cstc csto cstr csts ctor ctos ctot ctrc ctrs ctsc ctss ctts occc occt ocos ocro ocrr ocrs oct- octo octs oocr oooo ooos oort oost oots orco orcs oro- oror oros orot orro orrs orso ortc orto orts oscc osco osoo osor osos osro osso ostc ostr osts oto- otoo otor otos otro otrs otso otto otts rccc rccs rcos rcsc rcss rctc rcts rocc roco rocs roor roos root rorc roro rort rosc roso ross rost rotc roto rotr rots rott rrrr rscc rscs rsos rsts rtcc rtss rtts s-os sccc sccs scct scoo scor scot scr- scrc scrs scsc scso scsr scst sctc scto sctr scts soco socr socs soor soos soot soro sorr sors sort soso soss sost sotc soto sots srcc srct sros srtr sscc sscs ssoc ssot ssrc ssrs sssc ssss sstc ssts stcc stcs stoo stor stos stot strc stro strs stss sttc sttr tccc tcos tctc tcts toco toor toos toot torc toro torr tors tort tosc toso toss tost totc toto totr tots tott trcc troc troo tros trot trst trtc trtr tscc tsos tssr tsst tstc tsts ttss tttt