-er -up c-- ccc ccd cce ccf cck ccp ccr ccu cdc cdd cde cdf cdk cdp cdr cdu ce- cec ced cee cef cek cep cer ceu cfc cfd cfe cff cfk cfp cfr cfu ckc ckd cpc cpd cpe cpf cpk cpp cpr cpu crc crd cre crf crk crp crr cru cuc cud cue cuf cuk cup cur cuu dcc dcd dce dcf dck dcp dcr dcu ddc ddd dde ddf ddk ddp ddr ddu de- dec ded dee def dek dep der deu dfc dfd dfe dff dfk dfp dfr dfu dkc dke dkk dkp dkr dku dpc dpd dpe dpf dpk dpp dpr dpu drc drd dre drk drp drr dru duc dud due duf duk dup dur ec- ecc ecd ece ecf eck ecr ecu ed- edc edd ede edf edk edp edr edu eec eed eee eef eek eep eer ef- efc efd efe eff efp efr ekc ekd eke ekf ekp ekr eku ep- epc epd epe epf epp epr epu erc erd ere erf erk erp err eru eu- euc eud eue euf eup eur fcc fcd fce fcf fck fcp fcr fcu fdc fdd fde fdf fdk fdp fdr fdu fec fed fee fef fek fep fer feu ffc ffd ffe fff ffk ffp ffr ffu fkc fkf fkk fkp fpc fpd fpe fpk fpp fpr fpu frc frd fre frf frk frp frr fru fud fue fuf fuk fup fur fuu kcc kcd kce kck kcp kcr kcu kdc kde kdf kdk kdp kdr kdu ke- kec ked kee kef kek kep ker kfc kfd kff kfu kkc kke kkk kkp kkr kku kpc kpd kpe kpf kpk kpp kpr kpu krc krd krf krk krp krr kru kuc kud kue kuk kup kur kuu p-p pcc pcd pce pcf pck pcp pcr pcu pdc pdd pde pdf pdk pdp pdr pdu pec ped pee pef pek pep per peu pfc pfd pfe pff pfk pfp pfr pfu pkc pkd pke pkf pkp pkr pku ppc ppd ppe ppf ppk ppp ppr ppu prc prd pre prf prk prp prr pru puc pud pue puf puk pup pur puu rcc rcd rce rcf rcp rcr rcu rdc rdd rde rdf rdp rdr rdu re- rec red ree ref rek rep rer reu rfc rfd rfe rff rfk rfp rfr rfu rkc rke rkf rkk rkp rku rpc rpd rpe rpf rpk rpp rpr rpu rrc rrd rrf rrk rrp rrr rru ruc rud rue ruf ruk rup rur ruu ucc ucd uce ucf uck ucp ucr ucu udc udd ude udf udk udp udr udu uec ued uee uef uep uer ufc ufd ufe uff ufp ufr ufu ukc uke ukf ukk ukp ukr uku up- upc upd upe upf upk upp upr upu ur- urc urd ure urf urk urp urr uru uuc uue uur uuu