-ic a-a a-b a-c a-i aaa aab aac aag aai aak aar aas ab- aba abb abc abg abi abk abr abs ac- aca acb acc acg aci ack acr acs ag- aga agb agc agg agi agk agr ags ai- aia aib aic aig aii aik air ais aka akb akc akg aki akk akr aks ar- ara arb arc arg ari ark arr ars as- asa asb asc asg asi ask asr ass baa bab bac bag bai bak bar bas bba bbb bbc bbg bbi bbk bbr bbs bca bcb bcc bcg bci bck bcr bcs bga bgb bgc bgg bgi bgk bgr bgs bi- bia bib bic big bii bik bir bis bka bkb bkc bkg bkk bkr bks bra brb brg bri brk brr brs bsa bsb bsc bsg bsi bsk bsr bss c-- caa cab cac cag cai cak car cas cba cbb cbc cbg cbi cbk cbr cbs cca ccb ccc ccg cci cck ccr ccs cga cgb cgc cgg cgi cgr cgs ci- cia cib cic cig cii cik cir cis cka ckb ckc cki cks cra crb crc crg cri crk crr crs csa csb csc csg csi csk csr css gaa gab gac gag gai gak gar gas gba gbc gbg gbi gbk gbr gbs gca gcb gcc gcg gci gck gcr gcs gga ggb ggc ggg ggi ggr ggs gia gib gic gig gii gik gir gis gka gkb gks gra grb grc grg gri grk grr grs gsa gsb gsc gsg gsi gsk gsr gss ia- iaa iab iac iag iai iar ias iba ibb ibc ibg ibi ibk ibr ibs ica icb icc icg ici ick icr ics iga igb igc igg igi igk igr igs iia iib iic iii iir iis ika ikb ikc iki ikk ikr iks ir- ira irb irc irg iri irk irr irs is- isa isb isc isg isi isk isr iss ka- kaa kab kac kag kai kak kar kas kba kbb kbc kbi kbk kbr kbs kca kcb kcc kcg kci kck kcr kcs kga kgb kgc kgi kgs kia kib kic kig kii kik kir kis kkb kkc kki kkk kkr kks kra krc krg kri krk krr krs ksa ksb ksc ksg ksi ksk ksr kss ra- raa rab rac rag rai rak rar ras rba rbb rbc rbg rbi rbk rbr rbs rca rcb rcc rcg rci rcr rcs rga rgb rgc rgg rgi rgk rgr rgs ria rib ric rig rii rik rir ris rkb rkc rkg rkk rks rra rrb rrc rrg rri rrk rrr rrs rsa rsb rsc rsg rsi rsk rsr rss saa sab sac sag sai sak sar sas sba sbb sbc sbg sbi sbk sbr sbs sca scb scc scg sci sck scr scs sga sgb sgc sgg sgi sgk sgr sgs sia sib sic sig sii sik sir sis sk- ska skb skc skg ski skk skr sks sr- sra srb src srg sri srk srr srs ss- ssa ssb ssc ssg ssi ssk ssr sss

a-ak a-ii aaaa aaab aaac aaai aaar aaas aaba aabb aabc aabi aaca aacb aacc aaci aack aacr aacs aaib aaic aaii aais aaka aara aarc aari aars aasa aasc aasi aass abaa abab abac abag abai abak abar abas abb- abba abbb abbi abbr abbs abca abcb abcc abci abcr abcs abia abib abic abig abir abis abra abrc abri abrs abs- absa absi abss acaa acab acac acag acai acar acas acba acca accc acci accs acga acgi acgr acgs aci- acia acic acir acis acks acr- acra acrc acri acrr acrs acsa acsc acsi acss agac agag agai agar agas agba agca agcc agga aggi agia agib agic agig agii agir agis agra agri agsa agsg aiai aias aiba aica aicc aicr aics aiga aiia aiib aiic aiir aika aiki aiks aira airi airs aisa aisb aisg aisi aisk aisr akaa akai akar akas akca akia akik akir akis akka akki akr- akra aksa aksi arab arac arag arai arak arar aras arba arbi arbs arc- arca arci arcs arga argb argi args aria arib arig arii arik aris arka arki arks arr- arra arrc arrg arri arrk arrr arrs ars- arsa arsc arsi arsk asaa asab asac asag asai asak asar asas asba asc- asca ascb ascc asci ascr asia asic asii asik asir asis aska aski askr asks asra asrc asrg asrs assa assc assi assk assr asss ba-i baaa baak baar baas baba babb babi babr babs bac- baca bacc baci back bacs baga bagg bagi bags baia baib baic baig baik bair bais bak- baka baki bakr baks bar- bara barb barc barg bari bark barr bars basa basc basi bask bass bbas bbbb bbbs bbci bbga bbrc bbrg bcaa bcar bcas bcbc bcbg bcbs bcca bccc bcci bccs bcgs bcia bcis bcra bcrs bcsa bcsc bcss bgca bggs bgia biak biar bias biba bibb bibi bibs bica bicc bicg bici bick bics biga bigb bigc bigg bigs biis bira birb birg biri birk birr birs bis- bisa bisc bisk biss brab brac brag brai brak bras brca brcb bria bric brig brik bris brka brkb brrr brrs brsb brsr bsaa bsac bsas bsci bscs bsgs bsic bsra bssc caaa caab caac caas caba cabg cabi cabs cac- caca cacc caci cack cacr caga cagg cagi cagr cags caia caib caic caik cair cais caka cara carb carc cari cark carr cars casa casb casc casi cask casr cass cbac cbar cbbc cbbs cbca cbcc cbcr cbcs cbga cbgb cbia cbir cbka cbkg cbkr cbsa cbsc cbsi ccaa ccab ccac ccag ccai ccar ccas ccba ccbc ccca cccb cccc ccci cccs ccga ccgc ccgs ccic ccii ccir ccis ccra ccrc ccrg ccri ccrs ccsa ccsg ccsi ccss cgac cgas cgcc cgcg cggs cgis cgsb cgss ciaa ciak ciar cias ciba cibc cibi cica cicc cici cicr cics ciga cigi cigs ciia ciii ciis cika cikr cira cirb circ ciri cirk cirr cirs cis- cisa cisc cisk cisr