-er -up c-- ccc ccd cce cck cco ccp ccr ccu cdc cdd cde cdk cdo cdp cdr cdu ce- cec ced cee cek ceo cep cer ceu ckc ckd cko co- coc cod coe cok coo cop cor cou cpc cpd cpe cpk cpo cpp cpr cpu crc crd cre crk cro crp crr cru cuc cud cue cuk cuo cup cur cuu dcc dcd dce dck dco dcp dcr dcu ddc ddd dde ddk ddo ddp ddr ddu de- dec ded dee dek deo dep der deu dkc dke dkk dko dkp dkr dku doc dod doe dok doo dop dor dou dpc dpd dpe dpk dpo dpp dpr dpu drc drd dre drk dro drp drr dru duc dud due duk duo dup dur ec- ecc ecd ece eck eco ecr ecu ed- edc edd ede edk edo edp edr edu eec eed eee eek eeo eep eer ekc ekd eke eko ekp ekr eku eo- eoc eod eoe eok eoo eop eor eou ep- epc epd epe epo epp epr epu erc erd ere erk ero erp err eru eu- euc eud eue eup eur kcc kcd kce kck kcp kcr kcu kdc kde kdk kdo kdp kdr kdu ke- kec ked kee kek keo kep ker kkc kke kkk kkp kkr kku koc kod koe kok koo kop kor kou kpc kpd kpe kpk kpo kpp kpr kpu krc krd krk kro krp krr kru kuc kud kue kuk kup kur kuu oc- occ ocd ock oco ocp ocr ocu odc odd ode odo odp odr odu oec oed oee oeo oep oer okc okd oke okk oko okp okr oku oo- ooc ood ook ooo oop oor op- opc opd ope opk opo opp opr or- orc ord ore ork oro orp orr oru ou- ouc oud oue ouk ouo oup our p-p pcc pcd pce pck pco pcp pcr pcu pdc pdd pde pdk pdo pdp pdr pdu pec ped pee pek peo pep per peu pkc pkd pke pko pkp pkr pku poc pod poe pok poo pop por pou ppc ppd ppe ppk ppo ppp ppr ppu prc prd pre prk pro prp prr pru puc pud pue puk pup pur puu rcc rcd rce rco rcp rcr rcu rdc rdd rde rdo rdp rdr rdu re- rec red ree rek reo rep rer reu rkc rke rkk rko rkp rku roc rod roe rok roo rop ror rou rpc rpd rpe rpk rpo rpp rpr rpu rrc rrd rrk rrp rrr rru ruc rud rue ruk ruo rup rur ruu ucc ucd uce uck uco ucp ucr ucu udc udd ude udk udo udp udr udu uec ued uee uep uer ukc uke ukk ukp ukr uku uoc uod uoe uok uoo uop uor up- upc upd upe upk upo upp upr upu ur- urc urd ure urk uro urp urr uru uuc uue uur uuu