-ic a-a a-b a-c a-i aaa aab aac aaf aai aak aar aas ab- aba abb abc abf abi abk abr abs ac- aca acb acc acf aci ack acr acs af- afa afb afc aff afi afk afr afs ai- aia aib aic aif aii aik air ais aka akb akc aki akk akr aks ar- ara arb arc arf ari ark arr ars as- asa asb asc asf asi ask asr ass baa bab bac baf bai bak bar bas bba bbb bbc bbf bbi bbk bbr bbs bca bcb bcc bcf bci bck bcr bcs bfa bfb bfc bff bfi bfr bfs bi- bia bib bic bif bii bik bir bis bka bkb bkc bkf bkk bkr bks bra brb brf bri brk brr brs bsa bsb bsc bsf bsi bsk bsr bss c-- caa cab cac caf cai cak car cas cba cbb cbc cbf cbi cbk cbr cbs cca ccb ccc ccf cci cck ccr ccs cfa cfb cfc cff cfi cfk cfr cfs ci- cia cib cic cif cii cik cir cis cka ckb ckc cki cks cra crb crc crf cri crk crr crs csa csb csc csf csi csk csr css faa fab fac faf fai fak far fas fba fbb fbc fbf fbi fbk fbr fbs fca fcb fcc fcf fci fck fcr fcs ffa ffc fff ffi ffk ffr ffs fia fib fic fif fii fik fir fis fka fkb fkc fkf fki fkk fra frb frc frf fri frk frr frs fsa fsb fsc fsf fsi fsk fsr fss i-f ia- iaa iab iac iaf iai iar ias iba ibb ibc ibf ibi ibk ibr ibs ica icb icc icf ici ick icr ics ifa ifb ifc iff ifi ifr ifs iia iib iic iif iii iir iis ika ikb ikc ikf iki ikk ikr iks ir- ira irb irc irf iri irk irr irs is- isa isb isc isf isi isk isr iss ka- kaa kab kac kaf kai kak kar kas kba kbb kbc kbf kbi kbk kbr kbs kca kcb kcc kci kck kcr kcs kfa kfc kff kfi kfs kia kib kic kif kii kik kir kis kkb kkc kki kkk kkr kks kra krc krf kri krk krr krs ksa ksb ksc ksf ksi ksk ksr kss ra- raa rab rac raf rai rak rar ras rba rbb rbc rbf rbi rbk rbr rbs rca rcb rcc rcf rci rcr rcs rfa rfb rfc rff rfi rfk rfr rfs ria rib ric rif rii rik rir ris rkb rkc rkf rkk rks rra rrb rrc rrf rri rrk rrr rrs rsa rsb rsc rsf rsi rsk rsr rss saa sab sac saf sai sak sar sas sba sbb sbc sbf sbi sbk sbr sbs sca scb scc scf sci sck scr scs sfa sfb sfc sff sfi sfk sfr sfs sia sib sic sif sii sik sir sis sk- ska skb skc skf ski skk skr sks sr- sra srb src srf sri srk srr srs ss- ssa ssb ssc ssf ssi ssk ssr sss

a-ak a-ii aaaa aaab aaac aaaf aaai aaar aaas aaba aabb aabc aabi aaca aacb aacc aacf aaci aack aacr aacs aafa aafb aafc aaff aafi aaib aaic aaii aais aaka aara aarc aari aars aasa aasc aasf aasi aass abaa abab abac abaf abai abak abar abas abb- abba abbb abbi abbr abbs abca abcb abcc abcf abci abcr abcs abff abia abib abic abir abis abra abrc abri abrs abs- absa absf absi abss acaa acab acac acai acar acas acba acca accc accf acci accs acfc acfi acfs aci- acia acic acif acir acis acks acr- acra acrc acri acrr acrs acsa acsc acsi acss afaa afak afar afbs afca afcb afcc afci afcs affa affc affi affs afia afib afif afik afir afis afka afkr afr- afra afrc afri afrs afsa afsb afsc aiai aias aiba aica aicc aicf aicr aics aiff aifs aiia aiib aiic aiir aika aiki aiks aira airi airs aisa aisb aisi aisk aisr akaa akai akar akas akca akia akif akik akir akis akka akki akr- akra aksa aksi arab arac araf arai arak arar aras arba arbi arbs arc- arca arci arcs arfa arfb arfc arff arfs aria arib arif arii arik aris arka arki arks arr- arra arrc arri arrk arrr arrs ars- arsa arsc arsi arsk asaa asab asac asaf asai asak asar asas asba asc- asca ascb ascc asci ascr asfa asfi asia asic asif asii asik asir asis aska aski askr asks asra asrc asrs assa assc assi assk assr asss ba-i baaa baaf baak baar baas baba babb babi babr babs bac- baca bacc baci back bacs bafc baff baia baib baic baik bair bais bak- baka baki bakr baks bar- bara barb barc barf bari bark barr bars basa basc basf basi bask bass bbas bbbb bbbs bbci bbfc bbrc bcaa bcar bcas bcbc bcbs bcca bccc bcci bccs bcfc bcia bcis bcra bcrs bcsa bcsc bcss bfas bfca bfcs bffs bfsi bfsr biaf biak biar bias biba bibb bibi bibs bica bicc bici bick bics bifa biff bifi biis bira birb biri birk birr birs bis- bisa bisc bisk biss brab brac braf brai brak bras brca brcb brfc bria bric brik bris brka brkb brrr brrs brsb brsr bsaa bsac bsas bsci bscs bsfa bsfc bsff bsfs bsic bsra bssc caaa caab caac caaf caas caba cabf cabi cabs cac- caca cacc caci cack cacr cafa cafb cafc caff cafs caia caib caic caik cair cais caka cara carb carc carf cari cark carr cars casa casb casc casi cask casr cass cbac cbar cbbc cbbs cbca cbcc cbcr cbcs cbfb cbfc cbia cbir cbka cbkr cbsa cbsc cbsi ccaa ccab ccac ccaf ccai ccar ccas ccba ccbc ccca cccb cccc cccf ccci cccs ccfa ccfc ccff ccfi ccic ccii ccir ccis ccra ccrc ccrf ccri ccrs ccsa ccsf ccsi ccss cfaa cfab cfac cfar cfbc cfbr cfbs cfca cfcb cfcf