-er -ic a-a a-b a-c a-i aaa aab aac aae aai aak aao aar aas aau ab- aba abb abc abe abi abk abo abr abs abu ac- aca acb acc ace aci ack aco acr acs acu aea aeb aec aee aei aek aeo aer aes aeu ai- aia aib aic aie aii aik aio air ais aiu aka akb akc ake aki akk ako akr aks aku aoa aob aoc aoe aoi aok aoo aor aos aou ar- ara arb arc are ari ark aro arr ars aru as- asa asb asc ase asi ask aso asr ass asu au- aua aub auc aue aui auk auo aur aus b-u baa bab bac bae bai bak bao bar bas bau bba bbb bbc bbe bbi bbk bbo bbr bbs bbu bca bcb bcc bce bci bck bco bcr bcs bcu be- bea beb bec bee bei bek beo ber bes beu bi- bia bib bic bie bii bik bio bir bis biu bka bkb bkc bke bkk bko bkr bks boa bob boc boe boi bok boo bor bos bou bra brb bre bri brk bro brr brs bru bsa bsb bsc bse bsi bsk bso bsr bss bsu bua bub buc bue bui buk buo bur bus buu c-- caa cab cac cae cai cak cao car cas cau cba cbb cbc cbe cbi cbk cbo cbr cbs cbu cca ccb ccc cce cci cck cco ccr ccs ccu ce- cea ceb cec cee cei cek ceo cer ces ceu ci- cia cib cic cie cii cik cio cir cis ciu cka ckb ckc cki cko cks co- coa cob coc coe coi cok coo cor cos cou cra crb crc cre cri crk cro crr crs cru csa csb csc cse csi csk cso csr css csu cua cub cuc cue cui cuk cuo cur cus cuu eaa eab eac eae eai eak eao ear eas eau eba ebb ebc ebe ebi ebk ebo ebr ebs ebu ec- eca ecb ecc ece eci eck eco ecr ecs ecu eea eeb eec eee eek eeo eer ees eia eib eic eie eii eik eio eir eis eiu eka ekb ekc eke eki eko ekr eks eku eo- eoa eob eoc eoe eoi eok eoo eor eos eou era erb erc ere eri erk ero err ers eru es- esa esb esc ese esi esk eso esr ess esu eu- eua eub euc eue eui eur eus ia- iaa iab iac iae iai iao iar ias iau iba ibb ibc ibe ibi ibk ibo ibr ibs ibu ica icb icc ice ici ick ico icr ics icu ie- iea iec iee iei iek ier ies iia iib iic iie iii iio iir iis iiu ika ikb ikc ike iki ikk iko ikr iks iku io- ioa iob ioc ioe ioi ioo ior ios iou ir- ira irb irc ire iri irk iro irr irs iru is- isa isb isc ise isi isk iso isr iss isu iu- iua iub iuc iue iui iur ius ka- kaa kab kac kae kai kak kao kar kas kau kba kbb kbc kbe kbi kbk kbo kbr kbs kbu kca kcb kcc kce kci kck kcr kcs kcu ke- kea keb kec kee kei kek keo ker kes kia kib kic kie kii kik kio kir kis kiu kkb kkc kke kki kkk kkr kks kku koa kob koc koe koi kok koo kor kos kou kra krc kri krk kro krr krs kru ksa ksb ksc kse ksi ksk kso ksr kss ksu kub kuc kue kui kuk kur kus kuu o-i oaa oab oac oae oai oak oao oar oas oau ob- oba obb obc obe obi obk obo obr obs obu oc- oca ocb occ oci ock oco ocr ocs ocu oea oeb oec oee oei oeo oer oes oia oib oic oie oii oik oio oir ois oiu oka okb okc oke oki okk oko okr oks oku oo- ooa oob ooc ooi ook ooo oor oos or- ora orb orc ore ori ork oro orr ors oru os- osa osb osc ose osi osk oso osr oss osu ou- oua ouc oue oui ouk ouo our ous ra- raa rab rac rae rai rak rao rar ras rau rba rbb rbc rbe rbi rbk rbo rbr rbs rbu rca rcb rcc rce rci rco rcr rcs rcu re- rea reb rec ree rei rek reo rer res reu ria rib ric rie rii rik rio rir ris rkb rkc rke rkk rko rks rku roa rob roc roe roi rok roo ror ros rou rra rrb rrc rri rrk rrr rrs rru rsa rsb rsc rse rsi rsk rso rsr rss rsu rua rub ruc rue rui ruk ruo rur rus ruu saa sab sac sae sai sak sao sar sas sau sba sbb sbc sbe sbi sbk sbo sbr sbs sbu sca scb scc sce sci sck sco scr scs scu se- sea seb sec see sei sek seo ser ses seu sia sib sic sie sii sik sio sir sis siu sk- ska skb skc ske ski skk sko skr sks sku soa sob soc soe soi sok soo sor sos sou sr- sra srb src sre sri srk sro srr srs ss- ssa ssb ssc sse ssi ssk sso ssr sss ssu sua sub suc sue sui suk suo sur sus suu ua- uaa uab uac uae uai uak uao uar uas uau uba ubb ubc ube ubi ubk ubo ubr ubs ubu uca ucb ucc uce uci uck uco ucr ucs ucu uea ueb uec uee uei uer ues uia uib uic uie uii uio uir uis uiu uka ukb ukc uke uki ukk ukr uku uoa uob uoc uoe uok uoo uor uos ur- ura urb urc ure uri urk uro urr urs uru usa usb usc use usi usk uso usr uss usu uua uuc uue uur uus uuu