-er -up c-- ccc ccd cce ccp ccr ccu cdc cdd cde cdp cdr cdu ce- cec ced cee cep cer ceu cpc cpd cpe cpp cpr cpu crc crd cre crp crr cru cuc cud cue cup cur cuu dcc dcd dce dcp dcr dcu ddc ddd dde ddp ddr ddu de- dec ded dee dep der deu dpc dpd dpe dpp dpr dpu drc drd dre drp drr dru duc dud due dup dur ec- ecc ecd ece ecr ecu ed- edc edd ede edp edr edu eec eed eee eep eer ep- epc epd epe epp epr epu erc erd ere erp err eru eu- euc eud eue eup eur p-p pcc pcd pce pcp pcr pcu pdc pdd pde pdp pdr pdu pec ped pee pep per peu ppc ppd ppe ppp ppr ppu prc prd pre prp prr pru puc pud pue pup pur puu rcc rcd rce rcp rcr rcu rdc rdd rde rdp rdr rdu re- rec red ree rep rer reu rpc rpd rpe rpp rpr rpu rrc rrd rrp rrr rru ruc rud rue rup rur ruu ucc ucd uce ucp ucr ucu udc udd ude udp udr udu uec ued uee uep uer up- upc upd upe upp upr upu ur- urc urd ure urp urr uru uuc uue uur uuu