-ic a-a a-b a-c a-i aaa aab aac aag aai aak aan aar aas ab- aba abb abc abg abi abk abn abr abs ac- aca acb acc acg aci ack acn acr acs ag- aga agb agc agg agi agk agn agr ags ai- aia aib aic aig aii aik ain air ais aka akb akc akg aki akk akn akr aks an- ana anb anc ang ani ank ann anr ans ar- ara arb arc arg ari ark arn arr ars as- asa asb asc asg asi ask asn asr ass baa bab bac bag bai bak ban bar bas bba bbb bbc bbg bbi bbk bbn bbr bbs bca bcb bcc bcg bci bck bcn bcr bcs bga bgb bgc bgg bgi bgk bgn bgr bgs bi- bia bib bic big bii bik bin bir bis bka bkb bkc bkg bkk bkn bkr bks bna bnb bnc bng bni bnk bnn bnr bns bra brb brg bri brk brn brr brs bsa bsb bsc bsg bsi bsk bsn bsr bss c-- caa cab cac cag cai cak can car cas cba cbb cbc cbg cbi cbk cbn cbr cbs cca ccb ccc ccg cci cck ccn ccr ccs cga cgb cgc cgg cgi cgn cgr cgs ci- cia cib cic cig cii cik cin cir cis cka ckb ckc cki cks cn- cna cnb cnc cng cni cnn cnr cns cra crb crc crg cri crk crn crr crs csa csb csc csg csi csk csn csr css gaa gab gac gag gai gak gan gar gas gba gbc gbg gbi gbk gbn gbr gbs gca gcb gcc gcg gci gck gcn gcr gcs gga ggb ggc ggg ggi ggn ggr ggs gia gib gic gig gii gik gin gir gis gka gkb gkn gks gna gnb gnc gni gnn gnr gns gra grb grc grg gri grk grn grr grs gsa gsb gsc gsg gsi gsk gsn gsr gss ia- iaa iab iac iag iai ian iar ias iba ibb ibc ibg ibi ibk ibn ibr ibs ica icb icc icg ici ick icn icr ics iga igb igc igg igi igk ign igr igs iia iib iic iii iin iir iis ika ikb ikc iki ikk ikr iks in- ina inb inc ing ini ink inn inr ins ir- ira irb irc irg iri irk irn irr irs is- isa isb isc isg isi isk isn isr iss ka- kaa kab kac kag kai kak kan kar kas kba kbb kbc kbi kbk kbn kbr kbs kca kcb kcc kcg kci kck kcn kcr kcs kga kgb kgc kgi kgs kia kib kic kig kii kik kin kir kis kkb kkc kki kkk kkn kkr kks kn- kna knc kng kni knk knn knr kra krc krg kri krk krn krr krs ksa ksb ksc ksg ksi ksk ksn ksr kss n-i naa nab nac nag nai nak nan nar nas nba nbb nbc nbg nbi nbk nbn nbr nbs nca ncb ncc ncg nci nck ncn ncr ncs nga ngb ngc ngg ngi ngk ngn ngs nia nib nic nig nii nik nin nir nis nka nkc nki nkk nkn nkr nks nna nnb nnc nng nni nnk nnn nns nra nrb nrc nrg nri nrk nrn nrr nrs nsa nsb nsc nsg nsi nsk nsn nsr nss ra- raa rab rac rag rai rak ran rar ras rba rbb rbc rbg rbi rbk rbn rbr rbs rca rcb rcc rcg rci rcn rcr rcs rga rgb rgc rgg rgi rgk rgn rgr rgs ria rib ric rig rii rik rin rir ris rkb rkc rkg rkk rks rna rnb rnc rng rni rnn rnr rns rra rrb rrc rrg rri rrk rrn rrr rrs rsa rsb rsc rsg rsi rsk rsn rsr rss saa sab sac sag sai sak san sar sas sba sbb sbc sbg sbi sbk sbn sbr sbs sca scb scc scg sci sck scn scr scs sga sgb sgc sgg sgi sgk sgn sgr sgs sia sib sic sig sii sik sin sir sis sk- ska skb skc skg ski skk skr sks sna snb snc sng sni snk snn snr sns sr- sra srb src srg sri srk srn srr srs ss- ssa ssb ssc ssg ssi ssk ssn ssr sss