-er -up b-p b-u bbb bbe bbn bbp bbq bbr bbu be- beb bee ben bep beq ber beu bnb bne bnn bnp bnr bnu bpb bpe bpn bpp bpr bpu bqe bqp brb bre brn brp brq brr bru bub bue bun bup bur buu ebb ebe ebn ebp ebq ebr ebu eeb eee een eep eer en- enb ene enn enp enr enu ep- epb epe epn epp epq epr epu eqe eqn eqp eqq equ erb ere ern erp erq err eru eu- eub eue eun eup eur nbb nbe nbn nbp nbr nbu ne- neb nee nen nep ner neu nnb nne nnn nnp nnu npb npe npn npp npr npu nrb nre nrn nrp nrr nru nub nue nun nup nuq nur nuu p-p pbb pbe pbn pbp pbr pbu peb pee pen pep per peu pn- pnb pne pnn pnp pnr pnu ppb ppe ppn ppp ppq ppr ppu pqq pqr prb pre prn prp prq prr pru pub pue pun pup pur puu qbe qbq qee qen qep qnb qne qpp qpr qqq qqu qrb qre qrp qru qu- que qur rbb rbe rbn rbp rbr rbu re- reb ree ren rep req rer reu rnb rnn rnp rnr rnu rpb rpe rpn rpp rpr rpu rqn rrb rrn rrp rrq rrr rru rub rue run rup rur ruu ubb ube ubn ubp ubr ubu ueb uee uen uep uer un- unb une unn unp unq unr unu up- upb upe upn upp upr upu ur- urb ure urn urp urr uru uue uun uur uuu