c-cd cccc cccp cccs ccdc ccdp ccdr ccds ccoc ccod ccpp ccpr ccps ccrc ccrp ccrs ccsd ccsp ccss cd-r cdcs cddr cdos cdps cdrs cdss ckck ckco ckcs ckdo ckoc ckoo ckor ckos ckpc ckpr ckrc ckrd ckso cock coco cocp codd cods cok- coko cood cook coop coos copd copo copp copr cops cor- corc cord cork coro corp corr cors cosc coso cosp coss cpcs cpos cppd cpps cprs cpsc cpsk cpso cpsr crcc crcr crdc crkc crkp croc crod crok croo crop cror crpc crps crsp crss cscc cscd csco cscr cscs csdp csdr csks csor csos cspc cspd csps csrc csrd csrs cssd cssr dccc dccp dccs dcds dcop dcos dcpo dcps dcrk dcsc dcss dddd ddoc ddpo ddps ddrc ddss dkdc dock doco docs dod- dodd dodo dods doko dood dook doop door doos dopo dopp dopr dops dorc dord dork doro dorp dorr dors dosk doso doss dpcp dpos dppc dprk dpsd drod drop drrs drsp dscc dscp dscr dscs dsdp dsdr dsos dsps dsrc dsrp dsrr dssc dssp k-os kccc kccd kcck kccr kcdc kcdd kcdr kcds kckc kckk kcko kckr kcor kcos kcpc kcpo kcpr kcps kcrc kcro kcrp kcrr kcrs kcsc kcsd kcsp kcsr kcss kdcc kdcd kdco kdcr kddc kddd kddk kddr kdkd kdkk kdko kdkr kdoc kdok kdpr kdps kdro kdrs kdsc kdsd kdsk kdsp kdsr kdss kkcd kkck kkco kkcr kkcs kkdc kkdd kkdo kkkk kkoo kkor kkpc kkpk kkps kkrc kkrk kkro kkrr kkrs kksd kksp kksr kkss kocd kock kocp kocs kodk kodo kods kokc kokk koko kokp kokr koks kooc kook kooo koop koor koos kopp kopr kops korc kord kork koro korr kors kos- kosc kosd koso kosp kosr koss kpcc kpcr kpcs kpdc kpdo kpdr kpkk kpkr kpoc kpod kpok kpoo kpop kppc kppd kppk kppo kppp kppr kprc kprd kprk kpro kprp kprr kprs kpsc kpsd kpso kpsp krcc krcd krco krcs krdc krdd krdo krdr krds krkc krkd krkk krko krkr krks kroc krod krok kroo krop kror kros krpr krps krrc krrk krro krrr krrs krsc krsd krsk krsr krss ksck ksco kscr kscs ksdc ksdk ksdp ksdr ksds kskd kskk ksko kskr ksks ksoc ksok ksoo ksop ksor ksos kspc kspd kspk kspo kspr ksps ksro ksrp ksrr ksrs ksso kssr ksss occc ocds ocks ocos ocpd ocpp ocro ocrr ocrs oddd odds odoo odop odor odos odrp odso okko okok okor okpo okro okso oocr oooo ooos oops oord opds opo- opor opos oppo opps orco orcs ordo ords orko oro- orok oror oros orpc orps orro orrs orsk orso oscc osco osoo osor osos osrd osro ossd osso pccc pccs pcks pcod pcos pcpp pcps pcrc pcrd pcso pdcp pdoc pdos pdpr pdrc pdrs pdsd pdss pkcs pocd pock poco pocs pod- podd podo pods poko pood pook poop poor poos pop- popc popo popp pops porc pork poro porr pors posk poso poss ppcc ppcd ppcs ppdk ppds ppod ppos pppd pppo pppp ppps pprc ppss prcc prcd prcp prcs pro- proc prod proo prop pros prpd prps prrd prrs prsc prsd prso prss psco psdc psdp psdr psds psoc psos pspp pspr psps psrd psrk psrp pssc psso rccc rccs rcdc rcds rcos rcpd rcpo rcps rcrd rcsc rcsd rcss rdoc rdos rdpc rdso rkos rkss rocc rock roco rocs rodd rodo rods rokk roko rokr roks rood rook roop roor roos ropo rops rorc rork roro rosc roso rosp ross rpcs rpdp rpos rpps rrrr rrsp rscc rscs rsdd rsds rsos rspk rspo rsps s-os sccc sccp sccs scdc scdp scds sck- scok scoo scop scor scpo scps scr- scrc scrs scsc scsd scso scsr sdcc sdco sddc sdds sdpr sdps sdrc sdrs sdsc sdss skop skor skpc skpo sksd skss sock soco socr socs sodd sodo sods sokk soko sood sook soop soor soos sopd sopo sopp sops sord soro sorr sors soso soss spcc spco spcs spdc spdp spdr spkr spoc spod spok spoo spop spor spos sppd spps sprd spro sprs spsd spso spsp spss srcc sros srpc srps srsd srsp sscc sscp sscs ssdc ssdd ssdp ssoc ssop sspc sspo ssps ssrc ssrs sssc ssss