-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aag aai aak aao aar aas aat ab- aba abb abc abe abg abi abk abo abr abs abt ac- aca acb acc ace acg aci ack aco acr acs act aea aeb aec aee aeg aei aek aeo aer aes aet ag- aga agb agc age agg agi agk ago agr ags agt ai- aia aib aic aie aig aii aik aio air ais ait aka akb akc ake akg aki akk ako akr aks aoa aob aoc aoe aog aoi aok aoo aor aos aot ar- ara arb arc are arg ari ark aro arr ars art as- asa asb asc ase asg asi ask aso asr ass ast at- ata atb atc ate atg ati ato atr ats att baa bab bac bae bag bai bak bao bar bas bat bba bbb bbc bbe bbg bbi bbk bbo bbr bbs bbt bca bcb bcc bce bcg bci bck bco bcr bcs bct be- bea beb bec bee beg bei bek beo ber bes bet bga bgb bgc bge bgg bgi bgk bgo bgr bgs bgt bi- bia bib bic bie big bii bik bio bir bis bit bka bkb bkc bke bkg bkk bko bkr bks bkt boa bob boc boe bog boi bok boo bor bos bot bra brb bre brg bri brk bro brr brs brt bsa bsb bsc bse bsg bsi bsk bso bsr bss bst bta btb btc bte btg bti btk bto btr bts btt c-- caa cab cac cae cag cai cak cao car cas cat cba cbb cbc cbe cbg cbi cbk cbo cbr cbs cbt cca ccb ccc cce ccg cci cck cco ccr ccs cct ce- cea ceb cec cee ceg cei cek ceo cer ces cet cga cgb cgc cge cgg cgi cgo cgr cgs cgt ci- cia cib cic cie cig cii cik cio cir cis cit cka ckb ckc cki cko cks ckt co- coa cob coc coe cog coi cok coo cor cos cot cra crb crc cre crg cri crk cro crr crs crt csa csb csc cse csg csi csk cso csr css cst cta ctb ctc cte ctg cti ctk cto ctr cts ctt eaa eab eac eae eag eai eak eao ear eas eat eba ebb ebc ebe ebg ebi ebk ebo ebr ebs ebt ec- eca ecb ecc ece ecg eci eck eco ecr ecs ect eea eeb eec eee eeg eek eeo eer ees eet ega egb egc ege egg egi ego egr egs egt eia eib eic eie eig eii eik eio eir eis eit eka ekb ekc eke ekg eki eko ekr eks ekt eo- eoa eob eoc eoe eog eoi eok eoo eor eos eot era erb erc ere erg eri erk ero err ers ert es- esa esb esc ese esg esi esk eso esr ess est eta etb etc ete etg eti etk eto etr ets ett gaa gab gac gae gag gai gak gao gar gas gat gba gbc gbe gbg gbi gbk gbo gbr gbs gbt gca gcb gcc gce gcg gci gck gco gcr gcs gct ge- gea geb gec gee geg gei gek geo ger ges get gga ggb ggc ggg ggi ggo ggr ggs ggt gia gib gic gie gig gii gik gio gir gis git gka gkb gko gks gkt goa gob goc goe gog goi gok goo gor gos got gra grb grc gre grg gri grk gro grr grs grt gsa gsb gsc gse gsg gsi gsk gso gsr gss gst gta gtb gtc gte gtg gti gtk gto gtr gts gtt ia- iaa iab iac iae iag iai iao iar ias iat iba ibb ibc ibe ibg ibi ibk ibo ibr ibs ibt ica icb icc ice icg ici ick ico icr ics ict ie- iea iec iee ieg iei iek ier ies iet iga igb igc ige igg igi igk igo igr igs igt iia iib iic iie iii iio iir iis iit ika ikb ikc ike iki ikk iko ikr iks ikt io- ioa iob ioc ioe iog ioi ioo ior ios iot ir- ira irb irc ire irg iri irk iro irr irs irt is- isa isb isc ise isg isi isk iso isr iss ist ita itb itc ite itg iti itk ito its itt k-t ka- kaa kab kac kae kag kai kak kao kar kas kat kba kbb kbc kbe kbi kbk kbo kbr kbs kca kcb kcc kce kcg kci kck kcr kcs kct ke- kea keb kec kee keg kei kek keo ker kes ket kga kgb kgc kgi kgo kgs kia kib kic kie kig kii kik kio kir kis kit kkb kkc kke kki kkk kkr kks kkt koa kob koc koe kog koi kok koo kor kos kot kra krc krg kri krk kro krr krs krt ksa ksb ksc kse ksg ksi ksk kso ksr kss kst kta ktb ktc kte ktg ktk kto ktr kts ktt o-i oaa oab oac oae oag oai oak oao oar oas oat ob- oba obb obc obe obg obi obk obo obr obs obt oc- oca ocb occ ocg oci ock oco ocr ocs oct oea oeb oec oee oeg oei oeo oer oes oet oga ogc oge ogg ogi ogo ogs ogt oia oib oic oie oii oik oio oir ois oit oka okb okc oke okg oki okk oko okr oks oo- ooa oob ooc oog ooi ook ooo oor oos oot or- ora orb orc ore org ori ork oro orr ors ort os- osa osb osc ose osg osi osk oso osr oss ost ot- ota otb otc ote otg oti otk oto otr ots ott ra- raa rab rac rae rag rai rak rao rar ras rat rba rbb rbc rbe rbg rbi rbk rbo rbr rbs rbt rca rcb rcc rce rcg rci rco rcr rcs rct re- rea reb rec ree reg rei rek reo rer res