-er -up c-- ccc ccd cce cck ccp ccr ccu cdc cdd cde cdk cdp cdr cdu ce- cec ced cee cek cep cer ceu ckc ckd cpc cpd cpe cpk cpp cpr cpu crc crd cre crk crp crr cru cuc cud cue cuk cup cur cuu dcc dcd dce dck dcp dcr dcu ddc ddd dde ddk ddp ddr ddu de- dec ded dee dek dep der deu dkc dke dkk dkp dkr dku dpc dpd dpe dpk dpp dpr dpu drc drd dre drk drp drr dru duc dud due duk dup dur ec- ecc ecd ece eck ecr ecu ed- edc edd ede edk edp edr edu eec eed eee eek eep eer ekc ekd eke ekp ekr eku ep- epc epd epe epp epr epu erc erd ere erk erp err eru eu- euc eud eue eup eur kcc kcd kce kck kcp kcr kcu kdc kde kdk kdp kdr kdu ke- kec ked kee kek kep ker kkc kke kkk kkp kkr kku kpc kpd kpe kpk kpp kpr kpu krc krd krk krp krr kru kuc kud kue kuk kup kur kuu p-p pcc pcd pce pck pcp pcr pcu pdc pdd pde pdk pdp pdr pdu pec ped pee pek pep per peu pkc pkd pke pkp pkr pku ppc ppd ppe ppk ppp ppr ppu prc prd pre prk prp prr pru puc pud pue puk pup pur puu rcc rcd rce rcp rcr rcu rdc rdd rde rdp rdr rdu re- rec red ree rek rep rer reu rkc rke rkk rkp rku rpc rpd rpe rpk rpp rpr rpu rrc rrd rrk rrp rrr rru ruc rud rue ruk rup rur ruu ucc ucd uce uck ucp ucr ucu udc udd ude udk udp udr udu uec ued uee uep uer ukc uke ukk ukp ukr uku up- upc upd upe upk upp upr upu ur- urc urd ure urk urp urr uru uuc uue uur uuu