-er -up b-p b-u bbb bbc bbe bbg bbn bbo bbp bbr bbu bcb bcc bce bcg bcn bco bcp bcr bcu be- beb bec bee beg ben beo bep ber beu bgb bgc bge bgg bgn bgo bgp bgr bgu bnb bnc bne bng bnn bno bnp bnr bnu bob boc boe bog bon boo bop bor bou bpb bpc bpe bpg bpn bpo bpp bpr bpu brb bre brg brn bro brp brr bru bub buc bue bug bun buo bup bur buu c-- cbb cbc cbe cbg cbn cbo cbp cbr cbu ccb ccc cce ccg ccn cco ccp ccr ccu ce- ceb cec cee ceg cen ceo cep cer ceu cgb cgc cge cgg cgn cgo cgp cgr cgu cn- cnb cnc cne cng cnn cno cnp cnr cnu co- cob coc coe cog con coo cop cor cou cpb cpc cpe cpg cpn cpo cpp cpr cpu crb crc cre crg crn cro crp crr cru cub cuc cue cug cun cuo cup cur cuu ebb ebc ebe ebg ebn ebo ebp ebr ebu ec- ecb ecc ece ecg ecn eco ecr ecu eeb eec eee eeg een eeo eep eer egb egc ege egg egn ego egp egr egu en- enb enc ene eng enn eno enp enr enu eo- eob eoc eoe eog eon eoo eop eor eou ep- epb epc epe epg epn epo epp epr epu erb erc ere erg ern ero erp err eru eu- eub euc eue eug eun eup eur g-p gbc gbe gbg gbn gbo gbp gbr gbu gcb gcc gce gcg gcn gco gcp gcr gcu ge- geb gec gee geg gen geo gep ger geu ggb ggc ggg ggn ggo ggp ggr ggu gnb gnc gne gnn gno gnp gnr gnu gob goc goe gog gon goo gop gor gou gpb gpc gpe gpg gpn gpo gpp gpr gpu grb grc gre grg grn gro grp grr gru gu- gub guc gue gug gun guo gup gur guu nbb nbc nbe nbg nbn nbo nbp nbr nbu ncb ncc nce ncg ncn nco ncp ncr ncu ne- neb nec nee neg nen neo nep ner neu ngb ngc nge ngg ngn ngo ngp ngu nnb nnc nne nng nnn nno nnp nnu no- nob noc noe nog non noo nop nor nou npb npc npe npg npn npo npp npr npu nrb nrc nre nrg nrn nro nrp nrr nru nub nuc nue nug nun nuo nup nur nuu ob- obb obc obe obg obn obo obp obr obu oc- ocb occ ocg ocn oco ocp ocr ocu oeb oec oee oeg oen oeo oep oer ogc oge ogg ogn ogo ogp on- onb onc one ong onn ono onp onr onu oo- oob ooc oog oon ooo oop oor op- opb opc ope opg opn opo opp opr or- orb orc ore org orn oro orp orr oru ou- ouc oue oun ouo oup our p-p pbb pbc pbe pbg pbn pbo pbp pbr pbu pcb pcc pce pcg pcn pco pcp pcr pcu peb pec pee peg pen peo pep per peu pgb pgc pge pgg pgn pgo pgp pgr pn- pnb pnc pne png pnn pno pnp pnr pnu pob poc poe pog pon poo pop por pou ppb ppc ppe ppg ppn ppo ppp ppr ppu prb prc pre prg prn pro prp prr pru pub puc pue pug pun pup pur puu rbb rbc rbe rbg rbn rbo rbp rbr rbu rcb rcc rce rcg rcn rco rcp rcr rcu re- reb rec ree reg ren reo rep rer reu rgb rgc rge rgg rgn rgo rgp rgr rnb rnc rng rnn rno rnp rnr rnu rob roc roe rog ron roo rop ror rou rpb rpc rpe rpg rpn rpo rpp rpr rpu rrb rrc rrg rrn rrp rrr rru rub ruc rue rug run ruo rup rur ruu ubb ubc ube ubg ubn ubo ubp ubr ubu ucb ucc uce ucg ucn uco ucp ucr ucu ueb uec uee ueg uen uep uer ugb ugc uge ugg ugn ugo ugp ugr ugu un- unb unc une ung unn uno unp unr unu uob uoc uoe uog uon uoo uop uor up- upb upc upe upg upn upo upp upr upu ur- urb urc ure urg urn uro urp urr uru uuc uue uug uun uur uuu