-er -ic b-u bbb bbc bbd bbe bbi bbk bbr bbs bbu bcb bcc bcd bce bci bck bcr bcs bcu bdb bdc bdd bde bdi bdk bdr bds bdu be- beb bec bed bee bei bek ber bes beu bi- bib bic bid bie bii bik bir bis biu bkb bkc bke bkk bkr bks brb brd bre bri brk brr brs bru bsb bsc bsd bse bsi bsk bsr bss bsu bub buc bud bue bui buk bur bus buu c-- cbb cbc cbd cbe cbi cbk cbr cbs cbu ccb ccc ccd cce cci cck ccr ccs ccu cdb cdc cdd cde cdi cdk cdr cds cdu ce- ceb cec ced cee cei cek cer ces ceu ci- cib cic cid cie cii cik cir cis ciu ckb ckc ckd cki cks crb crc crd cre cri crk crr crs cru csb csc csd cse csi csk csr css csu cub cuc cud cue cui cuk cur cus cuu dbb dbc dbd dbe dbi dbk dbr dbs dbu dcb dcc dcd dce dci dck dcr dcs dcu ddb ddc ddd dde ddi ddk ddr dds ddu de- deb dec ded dee dei dek der des deu di- dib dic did die dii dik dir dis diu dkb dkc dke dki dkk dkr dks dku drb drc drd dre dri drk drr drs dru dsb dsc dsd dse dsi dsk dsr dss dsu dub duc dud due dui duk dur dus ebb ebc ebd ebe ebi ebk ebr ebs ebu ec- ecb ecc ecd ece eci eck ecr ecs ecu ed- edb edc edd ede edi edk edr eds edu eeb eec eed eee eek eer ees eib eic eid eie eii eik eir eis eiu ekb ekc ekd eke eki ekr eks eku erb erc erd ere eri erk err ers eru es- esb esc esd ese esi esk esr ess esu eu- eub euc eud eue eui eur eus i-d ibb ibc ibd ibe ibi ibk ibr ibs ibu icb icc icd ice ici ick icr ics icu idb idc idd ide idi idk idr ids idu ie- iec ied iee iei iek ier ies iib iic iid iie iii iir iis iiu ikb ikc ike iki ikk ikr iks iku ir- irb irc ird ire iri irk irr irs iru is- isb isc isd ise isi isk isr iss isu iu- iub iuc iud iue iui iur ius kbb kbc kbd kbe kbi kbk kbr kbs kbu kcb kcc kcd kce kci kck kcr kcs kcu kdb kdc kde kdk kdr kds kdu ke- keb kec ked kee kei kek ker kes kib kic kid kie kii kik kir kis kiu kkb kkc kke kki kkk kkr kks kku krc krd kri krk krr krs kru ksb ksc ksd kse ksi ksk ksr kss ksu kub kuc kud kue kui kuk kur kus kuu rbb rbc rbd rbe rbi rbk rbr rbs rbu rcb rcc rcd rce rci rcr rcs rcu rdb rdc rdd rde rdi rdr rds rdu re- reb rec red ree rei rek rer res reu rib ric rid rie rii rik rir ris rkb rkc rke rkk rks rku rrb rrc rrd rri rrk rrr rrs rru rsb rsc rsd rse rsi rsk rsr rss rsu rub ruc rud rue rui ruk rur rus ruu sbb sbc sbd sbe sbi sbk sbr sbs sbu scb scc scd sce sci sck scr scs scu sdb sdc sdd sde sdi sdk sdr sds sdu se- seb sec sed see sei sek ser ses seu sib sic sid sie sii sik sir sis siu sk- skb skc skd ske ski skk skr sks sku sr- srb src srd sre sri srk srr srs ss- ssb ssc ssd sse ssi ssk ssr sss ssu sub suc sud sue sui suk sur sus suu ubb ubc ube ubi ubk ubr ubs ubu ucb ucc ucd uce uci uck ucr ucs ucu udb udc udd ude udi udk udr uds udu ueb uec ued uee uei uer ues uib uic uid uie uii uir uis uiu ukb ukc uke uki ukk ukr uku ur- urb urc urd ure uri urk urr urs uru usb usc usd use usi usk usr uss usu uuc uue uur uus uuu