-ic a-a a-b a-c a-i a-t aaa aab aac aaf aag aai aak aao aar aat ab- aba abb abc abf abg abi abk abo abr abt ac- aca acb acc acf acg aci ack aco acr act af- afa afb afc aff afg afi afk afo afr aft ag- aga agb agc agf agg agi agk ago agr agt ai- aia aib aic aif aig aii aik aio air ait aka akb akc akg aki akk ako akr aoa aob aoc aof aog aoi aok aoo aor aot ar- ara arb arc arf arg ari ark aro arr art at- ata atb atc atf atg ati ato atr att baa bab bac baf bag bai bak bao bar bat bba bbb bbc bbf bbg bbi bbk bbo bbr bbt bca bcb bcc bcf bcg bci bck bco bcr bct bfa bfb bfc bff bfg bfi bfo bfr bft bga bgb bgc bgf bgg bgi bgk bgo bgr bgt bi- bia bib bic bif big bii bik bio bir bit bka bkb bkc bkf bkg bkk bko bkr bkt boa bob boc bof bog boi bok boo bor bot bra brb brf brg bri brk bro brr brt bta btb btc btf btg bti btk bto btr btt c-- caa cab cac caf cag cai cak cao car cat cba cbb cbc cbf cbg cbi cbk cbo cbr cbt cca ccb ccc ccf ccg cci cck cco ccr cct cfa cfb cfc cff cfg cfi cfk cfo cfr cft cga cgb cgc cgg cgi cgo cgr cgt ci- cia cib cic cif cig cii cik cio cir cit cka ckb ckc cki cko ckt co- coa cob coc cof cog coi cok coo cor cot cra crb crc crf crg cri crk cro crr crt cta ctb ctc ctf ctg cti ctk cto ctr ctt faa fab fac faf fag fai fak fao far fat fba fbb fbc fbf fbg fbi fbk fbo fbr fbt fca fcb fcc fcf fcg fci fck fco fcr fct ffa ffc fff ffg ffi ffk ffo ffr fft fga fgb fgc fgf fgg fgi fgr fgt fia fib fic fif fig fii fik fir fit fka fkb fkc fkf fkg fki fkk fkt foa fob foc fof fog foi fok foo for fot fra frb frc frf frg fri frk fro frr frt fta ftb ftc ftf ftg fti ftk fto ftr ftt gaa gab gac gaf gag gai gak gao gar gat gba gbc gbf gbg gbi gbk gbo gbr gbt gca gcb gcc gcf gcg gci gck gco gcr gct gfa gfb gfc gff gfi gfk gfo gfr gft gga ggb ggc ggg ggi ggo ggr ggt gia gib gic gif gig gii gik gio gir git gka gkb gko gkt goa gob goc gof gog goi gok goo gor got gra grb grc grf grg gri grk gro grr grt gta gtb gtc gtf gtg gti gtk gto gtr gtt i-f ia- iaa iab iac iaf iag iai iao iar iat iba ibb ibc ibf ibg ibi ibk ibo ibr ibt ica icb icc icf icg ici ick ico icr ict ifa ifb ifc iff ifg ifi ifo ifr ift iga igb igc igf igg igi igk igo igr igt iia iib iic iif iii iio iir iit ika ikb ikc ikf iki ikk iko ikr ikt io- ioa iob ioc iof iog ioi ioo ior iot ir- ira irb irc irf irg iri irk iro irr irt ita itb itc itf itg iti itk ito itt k-t ka- kaa kab kac kaf kag kai kak kao kar kat kba kbb kbc kbf kbi kbk kbo kbr kca kcb kcc kcg kci kck kcr kct kfa kfc kff kfg kfi kfo kga kgb kgc kgf kgi kgo kia kib kic kif kig kii kik kio kir kit kkb kkc kki kkk kkr kkt koa kob koc kof kog koi kok koo kor kot kra krc krf krg kri krk kro krr krt kta ktb ktc ktf ktg ktk kto ktr ktt o-i oaa oab oac oaf oag oai oak oao oar oat ob- oba obb obc obf obg obi obk obo obr obt oc- oca ocb occ ocf ocg oci ock oco ocr oct of- ofa ofb ofc off ofg ofi ofo ofr oft oga ogc ogf ogg ogi ogo ogt oia oib oic oif oii oik oio oir oit oka okb okc okg oki okk oko okr oo- ooa oob ooc oof oog ooi ook ooo oor oot or- ora orb orc orf org ori ork oro orr ort ot- ota otb otc otf otg oti otk oto otr ott ra- raa rab rac raf rag rai rak rao rar rat rba rbb rbc rbf rbg rbi rbk rbo rbr rbt rca rcb rcc rcf rcg rci rco rcr rct rfa rfb rfc rff rfg rfi rfk rfo rfr rft rga rgb rgc rgf rgg rgi rgk rgo rgr rgt ria rib ric rif rig rii rik rio rir rit rkb rkc rkf rkg rkk rko rkt roa rob roc rof rog roi rok roo ror rot rra rrb rrc rrf rrg rri rrk rrr rrt rta rtb rtc rtf rtg rti rtk rto rtr rtt taa tab tac taf tag tai tak tao tar tat tba tbb tbc tbf tbg tbi tbk tbo tbr tbt tca tcb tcc tcf tcg tci tck tco tcr tct tfa tfb tfc tff tfg tfi tfk tfo tfr tft tga tgb tgc tgf tgg tgi tgk tgo tgr tgt tia tib tic tif tig tii tik tio tir tit tka tkb tkc tkg tkk tko tkr tkt to- toa tob toc tof tog toi tok too tor tot tra trb trc trf trg tri trk tro trr trt tta ttb ttc ttf ttg tti ttk tto ttr ttt

a-ak a-ii a-ok aaaa aaab aaac aaaf aaai aaar aaba aabb aabc aabi aabt aaca aacb aacc aacf aaci aack aaco aacr aact aafa aafb aafc aaff aafi aaib aaic aaii aaka aaoo aara aarc