-er -up b-p b-u bbb bbc bbe bbk bbp bbr bbu bcb bcc bce bck bcp bcr bcu be- beb bec bee bek bep ber beu bkb bkc bke bkk bkp bkr bpb bpc bpe bpp bpr bpu brb bre brk brp brr bru bub buc bue buk bup bur buu c-- cbb cbc cbe cbk cbp cbr cbu ccb ccc cce cck ccp ccr ccu ce- ceb cec cee cek cep cer ceu ckb ckc cpb cpc cpe cpk cpp cpr cpu crb crc cre crk crp crr cru cub cuc cue cuk cup cur cuu ebb ebc ebe ebk ebp ebr ebu ec- ecb ecc ece eck ecr ecu eeb eec eee eek eep eer ekb ekc eke ekp ekr eku ep- epb epc epe epp epr epu erb erc ere erk erp err eru eu- eub euc eue eup eur kbb kbc kbe kbk kbp kbr kbu kcb kcc kce kck kcp kcr kcu ke- keb kec kee kek kep ker kkb kkc kke kkk kkp kkr kku kpc kpe kpk kpp kpr kpu krc krk krp krr kru kub kuc kue kuk kup kur kuu p-p pbb pbc pbe pbk pbp pbr pbu pcb pcc pce pck pcp pcr pcu peb pec pee pek pep per peu pkb pkc pke pkp pkr pku ppb ppc ppe ppk ppp ppr ppu prb prc pre prk prp prr pru pub puc pue puk pup pur puu rbb rbc rbe rbk rbp rbr rbu rcb rcc rce rcp rcr rcu re- reb rec ree rek rep rer reu rkb rkc rke rkk rkp rku rpb rpc rpe rpk rpp rpr rpu rrb rrc rrk rrp rrr rru rub ruc rue ruk rup rur ruu ubb ubc ube ubk ubp ubr ubu ucb ucc uce uck ucp ucr ucu ueb uec uee uep uer ukb ukc uke ukk ukp ukr uku up- upb upc upe upk upp upr upu ur- urb urc ure urk urp urr uru uuc uue uur uuu