-er -up b-p b-u bbb bbc bbe bbn bbp bbr bbs bbu bcb bcc bce bcn bcp bcr bcs bcu be- beb bec bee ben bep ber bes beu bnb bnc bne bnn bnp bnr bns bnu bpb bpc bpe bpn bpp bpr bps bpu brb bre brn brp brr brs bru bsb bsc bse bsn bsp bsr bss bsu bub buc bue bun bup bur bus buu c-- cbb cbc cbe cbn cbp cbr cbs cbu ccb ccc cce ccn ccp ccr ccs ccu ce- ceb cec cee cen cep cer ces ceu cn- cnb cnc cne cnn cnp cnr cns cnu cpb cpc cpe cpn cpp cpr cps cpu crb crc cre crn crp crr crs cru csb csc cse csn csp csr css csu cub cuc cue cun cup cur cus cuu ebb ebc ebe ebn ebp ebr ebs ebu ec- ecb ecc ece ecn ecr ecs ecu eeb eec eee een eep eer ees en- enb enc ene enn enp enr ens enu ep- epb epc epe epn epp epr eps epu erb erc ere ern erp err ers eru es- esb esc ese esn esp esr ess esu eu- eub euc eue eun eup eur eus nbb nbc nbe nbn nbp nbr nbs nbu ncb ncc nce ncn ncp ncr ncs ncu ne- neb nec nee nen nep ner nes neu nnb nnc nne nnn nnp nns nnu npb npc npe npn npp npr nps npu nrb nrc nre nrn nrp nrr nrs nru nsb nsc nse nsn nsp nsr nss nsu nub nuc nue nun nup nur nus nuu p-p pbb pbc pbe pbn pbp pbr pbs pbu pcb pcc pce pcn pcp pcr pcs pcu peb pec pee pen pep per pes peu pn- pnb pnc pne pnn pnp pnr pns pnu ppb ppc ppe ppn ppp ppr pps ppu prb prc pre prn prp prr prs pru ps- psb psc pse psn psp psr pss psu pub puc pue pun pup pur pus puu rbb rbc rbe rbn rbp rbr rbs rbu rcb rcc rce rcn rcp rcr rcs rcu re- reb rec ree ren rep rer res reu rnb rnc rnn rnp rnr rns rnu rpb rpc rpe rpn rpp rpr rps rpu rrb rrc rrn rrp rrr rrs rru rsb rsc rse rsn rsp rsr rss rsu rub ruc rue run rup rur rus ruu sbb sbc sbe sbn sbp sbr sbs sbu scb scc sce scn scp scr scs scu se- seb sec see sen sep ser ses seu snb snc sne snn snp snr sns snu spb spc spe spn spp spr sps spu sr- srb src sre srn srp srr srs ss- ssb ssc sse ssn ssp ssr sss ssu sub suc sue sun sup sur sus suu ubb ubc ube ubn ubp ubr ubs ubu ucb ucc uce ucn ucp ucr ucs ucu ueb uec uee uen uep uer ues un- unb unc une unn unp unr uns unu up- upb upc upe upn upp upr ups upu ur- urb urc ure urn urp urr urs uru usb usc use usn usp usr uss usu uuc uue uun uur uus uuu