-er -up b-p b-u bbb bbc bbe bbf bbp bbr bbt bbu bcb bcc bce bcf bcp bcr bct bcu be- beb bec bee bef bep ber bet beu bfb bfc bfe bff bfp bfr bft bfu bpb bpc bpe bpf bpp bpr bpt bpu brb bre brf brp brr brt bru btb btc bte btf btp btr btt btu bub buc bue buf bup bur but buu c-- cbb cbc cbe cbf cbp cbr cbt cbu ccb ccc cce ccf ccp ccr cct ccu ce- ceb cec cee cef cep cer cet ceu cfb cfc cfe cff cfp cfr cft cfu cpb cpc cpe cpf cpp cpr cpt cpu crb crc cre crf crp crr crt cru ctb ctc cte ctf ctp ctr ctt ctu cub cuc cue cuf cup cur cut cuu ebb ebc ebe ebf ebp ebr ebt ebu ec- ecb ecc ece ecf ecr ect ecu eeb eec eee eef eep eer eet ef- efb efc efe eff efp efr eft ep- epb epc epe epf epp epr ept epu erb erc ere erf erp err ert eru etb etc ete etf etp etr ett etu eu- eub euc eue euf eup eur eut fbb fbc fbe fbf fbp fbr fbt fbu fcb fcc fce fcf fcp fcr fct fcu feb fec fee fef fep fer fet feu ffc ffe fff ffp ffr fft ffu fpb fpc fpe fpp fpr fpt fpu frb frc fre frf frp frr frt fru ftb ftc fte ftf ftp ftr ftt ftu fub fue fuf fup fur fut fuu p-p pbb pbc pbe pbf pbp pbr pbt pbu pcb pcc pce pcf pcp pcr pct pcu peb pec pee pef pep per pet peu pfb pfc pfe pff pfp pfr pft pfu ppb ppc ppe ppf ppp ppr ppt ppu prb prc pre prf prp prr prt pru pt- ptb ptc pte ptf ptp ptr ptt ptu pub puc pue puf pup pur put puu rbb rbc rbe rbf rbp rbr rbt rbu rcb rcc rce rcf rcp rcr rct rcu re- reb rec ree ref rep rer ret reu rfb rfc rfe rff rfp rfr rft rfu rpb rpc rpe rpf rpp rpr rpt rpu rrb rrc rrf rrp rrr rrt rru rtb rtc rte rtf rtp rtr rtt rtu rub ruc rue ruf rup rur rut ruu tbb tbc tbe tbf tbp tbr tbt tbu tcb tcc tce tcf tcp tcr tct tcu te- teb tec tee tef tep ter tet teu tfb tfc tfe tff tfp tfr tft tfu tpb tpc tpe tpf tpp tpr tpt tpu trb trc tre trf trp trr trt tru ttb ttc tte ttf ttp ttr ttt ttu tub tuc tue tuf tup tur tut tuu ubb ubc ube ubf ubp ubr ubt ubu ucb ucc uce ucf ucp ucr uct ucu ueb uec uee uef uep uer uet ufc ufe uff ufp ufr uft ufu up- upb upc upe upf upp upr upt upu ur- urb urc ure urf urp urr urt uru utb utc ute utf utp utr utt utu uuc uue uur uut uuu