-al -ic a-a a-b a-c a-i aaa aab aac aaf aai aak aal aar aas ab- aba abb abc abf abi abk abl abr abs ac- aca acb acc acf aci ack acl acr acs af- afa afb afc aff afi afk afl afr afs ai- aia aib aic aif aii aik ail air ais aka akb akc aki akk akl akr aks al- ala alb alc alf ali alk all alr als ar- ara arb arc arf ari ark arl arr ars as- asa asb asc asf asi ask asl asr ass baa bab bac baf bai bak bal bar bas bba bbb bbc bbf bbi bbk bbl bbr bbs bca bcb bcc bcf bci bck bcl bcr bcs bfa bfb bfc bff bfi bfl bfr bfs bi- bia bib bic bif bii bik bil bir bis bka bkb bkc bkf bkk bkl bkr bks bla blb blc blf bli blk bll blr bls bra brb brf bri brk brl brr brs bsa bsb bsc bsf bsi bsk bsl bsr bss c-- caa cab cac caf cai cak cal car cas cba cbb cbc cbf cbi cbk cbl cbr cbs cca ccb ccc ccf cci cck ccl ccr ccs cfa cfb cfc cff cfi cfk cfl cfr cfs ci- cia cib cic cif cii cik cil cir cis cka ckb ckc cki cks cl- cla clb clc clf cli clk cll clr cls cra crb crc crf cri crk crl crr crs csa csb csc csf csi csk csl csr css faa fab fac faf fai fak fal far fas fba fbb fbc fbf fbi fbk fbl fbr fbs fca fcb fcc fcf fci fck fcl fcr fcs ffa ffc fff ffi ffk ffl ffr ffs fia fib fic fif fii fik fil fir fis fka fkb fkc fkf fki fkk fkl fla flb flc flf fli fll flr fls fra frb frc frf fri frk frl frr frs fsa fsb fsc fsf fsi fsk fsl fsr fss i-f ia- iaa iab iac iaf iai ial iar ias iba ibb ibc ibf ibi ibk ibl ibr ibs ica icb icc icf ici ick icl icr ics ifa ifb ifc iff ifi ifl ifr ifs iia iib iic iif iii iil iir iis ika ikb ikc ikf iki ikk ikl ikr iks il- ila ilb ilc ilf ili ilk ill ilr ils ir- ira irb irc irf iri irk irl irr irs is- isa isb isc isf isi isk isl isr iss ka- kaa kab kac kaf kai kak kal kar kas kba kbb kbc kbf kbi kbk kbl kbr kbs kca kcb kcc kci kck kcl kcr kcs kfa kfc kff kfi kfs kia kib kic kif kii kik kil kir kis kkb kkc kki kkk kkl kkr kks kl- kla klb klc klf kli klr kls kra krc krf kri krk krl krr krs ksa ksb ksc ksf ksi ksk ksl ksr kss la- laa lab lac laf lai lak lal lar las lba lbb lbc lbf lbi lbk lbl lbr lbs lca lcb lcc lcf lci lck lcl lcr lcs lfa lfb lfc lff lfi lfk lfl lfr lfs lia lib lic lif lii lik lil lir lis lka lkb lkl lkr lks lla llb llc llf lli llk lll llr lls lra lrb lrc lrf lri lrk lrr lrs lsa lsb lsc lsf lsi lsk lsl lsr lss ra- raa rab rac raf rai rak ral rar ras rba rbb rbc rbf rbi rbk rbl rbr rbs rca rcb rcc rcf rci rcl rcr rcs rfa rfb rfc rff rfi rfk rfl rfr rfs ria rib ric rif rii rik ril rir ris rkb rkc rkf rkk rks rla rlc rlf rli rll rlr rls rra rrb rrc rrf rri rrk rrl rrr rrs rsa rsb rsc rsf rsi rsk rsl rsr rss saa sab sac saf sai sak sal sar sas sba sbb sbc sbf sbi sbk sbl sbr sbs sca scb scc scf sci sck scl scr scs sfa sfb sfc sff sfi sfk sfl sfr sfs sia sib sic sif sii sik sil sir sis sk- ska skb skc skf ski skk skl skr sks sla slb slc slf sli slk sll slr sls sr- sra srb src srf sri srk srl srr srs ss- ssa ssb ssc ssf ssi ssk ssl ssr sss

a-ak a-ii aaaa aaab aaac aaaf aaai aaal aaar aaas aaba aabb aabc aabi aabl aaca aacb aacc aacf aaci aack aacl aacr aacs aafa aafb aafc aaff aafi aafl aaib aaic aaii aais aaka aala aalc aali aall aals aara aarc aari aars aasa aasc aasf aasi aass abaa abab abac abaf abai abak abal abar abas abb- abba abbb abbi abbr abbs abca abcb abcc abcf abci abcl abcr abcs abff abia abib abic abil abir abis abla abls abra abrc abri abrs abs- absa absf absi absl abss acaa acab acac acai acar acas acba acbl acca accc accf acci accs acfc acfi acfl acfs aci- acia acic acif acir acis acks acla aclc acli aclr acls acr- acra acrc acri acrr acrs acsa acsc acsi acsl acss afaa afak afar afbs afca afcb afcc afci afcs affa affc affi affs afia afib afif afik afil afir afis afka afkr afla aflc afr- afra afrc afri afrs afsa afsb afsc aiai aias aiba aibl aica aicc aicf aicr aics aiff aifl aifs aiia aiib aiic aiir aika aiki aiks aila aili ails aira airi airs aisa aisb aisi aisk aisl aisr akaa akai akal akar akas akca akia akif akik akil akir akis akka akki akr- akra aksa aksi alaa alac alai alak alal alar alas alb- alba albc albi albs alca alcc alcs alfa alfi alfs ali- alia alib alif alii alik alil alir alis alk- alka alkb alki all- alla alli alll allr alls alsa alsc arab arac araf arai arak aral arar aras arba arbi arbs arc- arca arci arcs arfa arfb arfc arff arfs aria arib arif arii arik aril aris arka