-er -up b-p b-u bbb bbe bbi bbk bbp bbr bbs bbu be- beb bee bei bek bep ber bes beu bi- bib bie bii bik bip bir bis biu bkb bke bkk bkp bkr bks bpb bpe bpi bpp bpr bps bpu brb bre bri brk brp brr brs bru bsb bse bsi bsk bsp bsr bss bsu bub bue bui buk bup bur bus buu ebb ebe ebi ebk ebp ebr ebs ebu eeb eee eek eep eer ees eib eie eii eik eip eir eis eiu ekb eke eki ekp ekr eks eku ep- epb epe epi epp epr eps epu erb ere eri erk erp err ers eru es- esb ese esi esk esp esr ess esu eu- eub eue eui eup eur eus ibb ibe ibi ibk ibp ibr ibs ibu ie- iee iei iek iep ier ies iib iie iii iip iir iis iiu ikb ike iki ikk ikr iks iku ipb ipe ipi ipp ipr ips ipu ir- irb ire iri irk irp irr irs iru is- isb ise isi isk isp isr iss isu iu- iub iue iui iup iur ius kbb kbe kbi kbk kbp kbr kbs kbu ke- keb kee kei kek kep ker kes kib kie kii kik kip kir kis kiu kkb kke kki kkk kkp kkr kks kku kpe kpi kpk kpp kpr kps kpu kri krk krp krr krs kru ksb kse ksi ksk ksp ksr kss ksu kub kue kui kuk kup kur kus kuu p-p pbb pbe pbi pbk pbp pbr pbs pbu peb pee pei pek pep per pes peu pib pie pii pik pip pir pis piu pkb pke pki pkp pkr pks pku ppb ppe ppi ppk ppp ppr pps ppu prb pre pri prk prp prr prs pru ps- psb pse psi psk psp psr pss psu pub pue pui puk pup pur pus puu rbb rbe rbi rbk rbp rbr rbs rbu re- reb ree rei rek rep rer res reu rib rie rii rik rip rir ris rkb rke rkk rkp rks rku rpb rpe rpi rpk rpp rpr rps rpu rrb rri rrk rrp rrr rrs rru rsb rse rsi rsk rsp rsr rss rsu rub rue rui ruk rup rur rus ruu sbb sbe sbi sbk sbp sbr sbs sbu se- seb see sei sek sep ser ses seu sib sie sii sik sip sir sis siu sk- skb ske ski skk skp skr sks sku spb spe spi spk spp spr sps spu sr- srb sre sri srk srp srr srs ss- ssb sse ssi ssk ssp ssr sss ssu sub sue sui suk sup sur sus suu ubb ube ubi ubk ubp ubr ubs ubu ueb uee uei uep uer ues uib uie uii uip uir uis uiu ukb uke uki ukk ukp ukr uku up- upb upe upi upk upp upr ups upu ur- urb ure uri urk urp urr urs uru usb use usi usk usp usr uss usu uue uur uus uuu