-er c-- ccc ccd cce cck cco ccr ccs cct ccu cdc cdd cde cdk cdo cdr cds cdt cdu ce- cec ced cee cek ceo cer ces cet ceu ckc ckd cko cks ckt co- coc cod coe cok coo cor cos cot cou crc crd cre crk cro crr crs crt cru csc csd cse csk cso csr css cst csu ctc ctd cte ctk cto ctr cts ctt ctu cuc cud cue cuk cuo cur cus cut cuu dcc dcd dce dck dco dcr dcs dct dcu ddc ddd dde ddk ddo ddr dds ddt ddu de- dec ded dee dek deo der des det deu dkc dke dkk dko dkr dks dkt dku doc dod doe dok doo dor dos dot dou drc drd dre drk dro drr drs drt dru dsc dsd dse dsk dso dsr dss dst dsu dtc dtd dte dtk dto dtr dts dtt dtu duc dud due duk duo dur dus dut ec- ecc ecd ece eck eco ecr ecs ect ecu ed- edc edd ede edk edo edr eds edt edu eec eed eee eek eeo eer ees eet ekc ekd eke eko ekr eks ekt eku eo- eoc eod eoe eok eoo eor eos eot eou erc erd ere erk ero err ers ert eru es- esc esd ese esk eso esr ess est esu etc etd ete etk eto etr ets ett etu eu- euc eud eue eur eus eut k-t kcc kcd kce kck kcr kcs kct kcu kdc kde kdk kdo kdr kds kdt kdu ke- kec ked kee kek keo ker kes ket kkc kke kkk kkr kks kkt kku koc kod koe kok koo kor kos kot kou krc krd krk kro krr krs krt kru ksc ksd kse ksk kso ksr kss kst ksu ktc kte ktk kto ktr kts ktt ktu kuc kud kue kuk kur kus kut kuu oc- occ ocd ock oco ocr ocs oct ocu odc odd ode odo odr ods odt odu oec oed oee oeo oer oes oet okc okd oke okk oko okr oks oku oo- ooc ood ook ooo oor oos oot or- orc ord ore ork oro orr ors ort oru os- osc osd ose osk oso osr oss ost osu ot- otc otd ote otk oto otr ots ott otu ou- ouc oud oue ouk ouo our ous out rcc rcd rce rco rcr rcs rct rcu rdc rdd rde rdo rdr rds rdt rdu re- rec red ree rek reo rer res ret reu rkc rke rkk rko rks rkt rku roc rod roe rok roo ror ros rot rou rrc rrd rrk rrr rrs rrt rru rsc rsd rse rsk rso rsr rss rst rsu rtc rtd rte rtk rto rtr rts rtt rtu ruc rud rue ruk ruo rur rus rut ruu scc scd sce sck sco scr scs sct scu sdc sdd sde sdk sdo sdr sds sdt sdu se- sec sed see sek seo ser ses set seu sk- skc skd ske skk sko skr sks skt sku soc sod soe sok soo sor sos sot sou sr- src srd sre srk sro srr srs srt ss- ssc ssd sse ssk sso ssr sss sst ssu stc std ste stk sto str sts stt stu suc sud sue suk suo sur sus sut suu tcc tcd tce tck tco tcr tcs tct tcu tdc tdd tde tdk tdo tdr tds tdt tdu te- tec ted tee tek teo ter tes tet teu tkc tke tkk tko tkr tks tkt to- toc tod toe tok too tor tos tot tou trc trd tre trk tro trr trs trt tru tsc tsd tse tsk tso tsr tss tst tsu ttc ttd tte ttk tto ttr tts ttt ttu tuc tud tue tuk tuo tur tus tut tuu ucc ucd uce uck uco ucr ucs uct ucu udc udd ude udk udo udr uds udt udu uec ued uee uer ues uet ukc uke ukk ukr uku uoc uod uoe uok uoo uor uos uot ur- urc urd ure urk uro urr urs urt uru usc usd use usk uso usr uss ust usu utc utd ute utk uto utr uts utt utu uuc uue uur uus uut uuu