-er -up b-p b-u bbb bbe bbi bbk bbl bbp bbr bbu be- beb bee bei bek bel bep ber beu bi- bib bie bii bik bil bip bir biu bkb bke bkk bkl bkp bkr blb ble bli blk bll blp blr blu bpb bpe bpi bpl bpp bpr bpu brb bre bri brk brl brp brr bru bub bue bui buk bul bup bur buu ebb ebe ebi ebk ebl ebp ebr ebu eeb eee eek eel eep eer eib eie eii eik eil eip eir eiu ekb eke eki ekl ekp ekr eku elb ele eli elk ell elp elr elu ep- epb epe epi epl epp epr epu erb ere eri erk erl erp err eru eu- eub eue eui eul eup eur ibb ibe ibi ibk ibl ibp ibr ibu ie- iee iei iek iel iep ier iib iie iii iil iip iir iiu ikb ike iki ikk ikl ikr iku il- ilb ile ili ilk ill ilp ilr ilu ipb ipe ipi ipl ipp ipr ipu ir- irb ire iri irk irl irp irr iru iu- iub iue iui iup iur kbb kbe kbi kbk kbl kbp kbr kbu ke- keb kee kei kek kel kep ker kib kie kii kik kil kip kir kiu kkb kke kki kkk kkl kkp kkr kku kl- klb kli klr klu kpe kpi kpk kpl kpp kpr kpu kri krk krl krp krr kru kub kue kui kuk kul kup kur kuu l-p lbb lbe lbi lbk lbl lbp lbr lbu leb lee lei lek lel lep ler leu lib lie lii lik lil lip lir liu lkb lkl lkp lkr llb lle lli llk lll llp llr llu lpb lpe lpi lpk lpl lpp lpr lpu lrb lri lrk lrp lrr lru lub lue lui luk lul lup lur luu p-p pbb pbe pbi pbk pbl pbp pbr pbu peb pee pei pek pel pep per peu pib pie pii pik pil pip pir piu pkb pke pki pkl pkp pkr pku plb ple pli plk pll plp plr plu ppb ppe ppi ppk ppl ppp ppr ppu prb pre pri prk prl prp prr pru pub pue pui puk pul pup pur puu rbb rbe rbi rbk rbl rbp rbr rbu re- reb ree rei rek rel rep rer reu rib rie rii rik ril rip rir rkb rke rkk rkp rku rle rli rll rlp rlr rlu rpb rpe rpi rpk rpl rpp rpr rpu rrb rri rrk rrl rrp rrr rru rub rue rui ruk rup rur ruu ubb ube ubi ubk ubl ubp ubr ubu ueb uee uei uel uep uer uib uie uii uil uip uir uiu ukb uke uki ukk ukl ukp ukr uku ulb ule uli ulk ull ulp ulr ulu up- upb upe upi upk upp upr upu ur- urb ure uri urk url urp urr uru uue uur uuu