-er b-u bbb bbd bbe bbi bbk bbo bbr bbs bbu bdb bdd bde bdi bdk bdo bdr bds bdu be- beb bed bee bei bek beo ber bes beu bi- bib bid bie bii bik bio bir bis biu bkb bke bkk bko bkr bks bob bod boe boi bok boo bor bos bou brb brd bre bri brk bro brr brs bru bsb bsd bse bsi bsk bso bsr bss bsu bub bud bue bui buk buo bur bus buu dbb dbd dbe dbi dbk dbo dbr dbs dbu ddb ddd dde ddi ddk ddo ddr dds ddu de- deb ded dee dei dek deo der des deu di- dib did die dii dik dio dir dis diu dkb dke dki dkk dko dkr dks dku dob dod doe doi dok doo dor dos dou drb drd dre dri drk dro drr drs dru dsb dsd dse dsi dsk dso dsr dss dsu dub dud due dui duk duo dur dus ebb ebd ebe ebi ebk ebo ebr ebs ebu ed- edb edd ede edi edk edo edr eds edu eeb eed eee eek eeo eer ees eib eid eie eii eik eio eir eis eiu ekb ekd eke eki eko ekr eks eku eo- eob eod eoe eoi eok eoo eor eos eou erb erd ere eri erk ero err ers eru es- esb esd ese esi esk eso esr ess esu eu- eub eud eue eui eur eus i-d ibb ibd ibe ibi ibk ibo ibr ibs ibu idb idd ide idi idk ido idr ids idu ie- ied iee iei iek ier ies iib iid iie iii iio iir iis iiu ikb ike iki ikk iko ikr iks iku io- iob iod ioe ioi ioo ior ios iou ir- irb ird ire iri irk iro irr irs iru is- isb isd ise isi isk iso isr iss isu iu- iub iud iue iui iur ius kbb kbd kbe kbi kbk kbo kbr kbs kbu kdb kde kdk kdo kdr kds kdu ke- keb ked kee kei kek keo ker kes kib kid kie kii kik kio kir kis kiu kkb kke kki kkk kkr kks kku kob kod koe koi kok koo kor kos kou krd kri krk kro krr krs kru ksb ksd kse ksi ksk kso ksr kss ksu kub kud kue kui kuk kur kus kuu o-i ob- obb obd obe obi obk obo obr obs obu odb odd ode odi odo odr ods odu oeb oed oee oei oeo oer oes oib oid oie oii oik oio oir ois oiu okb okd oke oki okk oko okr oks oku oo- oob ood ooi ook ooo oor oos or- orb ord ore ori ork oro orr ors oru os- osb osd ose osi osk oso osr oss osu ou- oud oue oui ouk ouo our ous rbb rbd rbe rbi rbk rbo rbr rbs rbu rdb rdd rde rdi rdo rdr rds rdu re- reb red ree rei rek reo rer res reu rib rid rie rii rik rio rir ris rkb rke rkk rko rks rku rob rod roe roi rok roo ror ros rou rrb rrd rri rrk rrr rrs rru rsb rsd rse rsi rsk rso rsr rss rsu rub rud rue rui ruk ruo rur rus ruu sbb sbd sbe sbi sbk sbo sbr sbs sbu sdb sdd sde sdi sdk sdo sdr sds sdu se- seb sed see sei sek seo ser ses seu sib sid sie sii sik sio sir sis siu sk- skb skd ske ski skk sko skr sks sku sob sod soe soi sok soo sor sos sou sr- srb srd sre sri srk sro srr srs ss- ssb ssd sse ssi ssk sso ssr sss ssu sub sud sue sui suk suo sur sus suu ubb ube ubi ubk ubo ubr ubs ubu udb udd ude udi udk udo udr uds udu ueb ued uee uei uer ues uib uid uie uii uio uir uis uiu ukb uke uki ukk ukr uku uob uod uoe uok uoo uor uos ur- urb urd ure uri urk uro urr urs uru usb usd use usi usk uso usr uss usu uue uur uus uuu