-ic a-a a-b a-c a-i aaa aab aac aag aai aak aan aao aar aas ab- aba abb abc abg abi abk abn abo abr abs ac- aca acb acc acg aci ack acn aco acr acs ag- aga agb agc agg agi agk agn ago agr ags ai- aia aib aic aig aii aik ain aio air ais aka akb akc akg aki akk akn ako akr aks an- ana anb anc ang ani ank ann ano anr ans aoa aob aoc aog aoi aok aon aoo aor aos ar- ara arb arc arg ari ark arn aro arr ars as- asa asb asc asg asi ask asn aso asr ass baa bab bac bag bai bak ban bao bar bas bba bbb bbc bbg bbi bbk bbn bbo bbr bbs bca bcb bcc bcg bci bck bcn bco bcr bcs bga bgb bgc bgg bgi bgk bgn bgo bgr bgs bi- bia bib bic big bii bik bin bio bir bis bka bkb bkc bkg bkk bkn bko bkr bks bna bnb bnc bng bni bnk bnn bno bnr bns boa bob boc bog boi bok bon boo bor bos bra brb brg bri brk brn bro brr brs bsa bsb bsc bsg bsi bsk bsn bso bsr bss c-- caa cab cac cag cai cak can cao car cas cba cbb cbc cbg cbi cbk cbn cbo cbr cbs cca ccb ccc ccg cci cck ccn cco ccr ccs cga cgb cgc cgg cgi cgn cgo cgr cgs ci- cia cib cic cig cii cik cin cio cir cis cka ckb ckc cki cko cks cn- cna cnb cnc cng cni cnn cno cnr cns co- coa cob coc cog coi cok con coo cor cos cra crb crc crg cri crk crn cro crr crs csa csb csc csg csi csk csn cso csr css gaa gab gac gag gai gak gan gao gar gas gba gbc gbg gbi gbk gbn gbo gbr gbs gca gcb gcc gcg gci gck gcn gco gcr gcs gga ggb ggc ggg ggi ggn ggo ggr ggs gia gib gic gig gii gik gin gio gir gis gka gkb gkn gko gks gna gnb gnc gni gnn gno gnr gns goa gob goc gog goi gok gon goo gor gos gra grb grc grg gri grk grn gro grr grs gsa gsb gsc gsg gsi gsk gsn gso gsr gss ia- iaa iab iac iag iai ian iao iar ias iba ibb ibc ibg ibi ibk ibn ibo ibr ibs ica icb icc icg ici ick icn ico icr ics iga igb igc igg igi igk ign igo igr igs iia iib iic iii iin iio iir iis ika ikb ikc iki ikk iko ikr iks in- ina inb inc ing ini ink inn ino inr ins io- ioa iob ioc iog ioi ion ioo ior ios ir- ira irb irc irg iri irk irn iro irr irs is- isa isb isc isg isi isk isn iso isr iss ka- kaa kab kac kag kai kak kan kao kar kas kba kbb kbc kbi kbk kbn kbo kbr kbs kca kcb kcc kcg kci kck kcn kcr kcs kga kgb kgc kgi kgo kgs kia kib kic kig kii kik kin kio kir kis kkb kkc kki kkk kkn kkr kks kn- kna knc kng kni knk knn kno knr koa kob koc kog koi kok kon koo kor kos kra krc krg kri krk krn kro krr krs ksa ksb ksc ksg ksi ksk ksn kso ksr kss n-i naa nab nac nag nai nak nan nao nar nas nba nbb nbc nbg nbi nbk nbn nbo nbr nbs nca ncb ncc ncg nci nck ncn nco ncr ncs nga ngb ngc ngg ngi ngk ngn ngo ngs nia nib nic nig nii nik nin nio nir nis nka nkc nki nkk nkn nko nkr nks nna nnb nnc nng nni nnk nnn nno nns no- noa nob noc nog noi nok non noo nor nos nra nrb nrc nrg nri nrk nrn nro nrr nrs nsa nsb nsc nsg nsi nsk nsn nso nsr nss o-i oaa oab oac oag oai oak oan oao oar oas ob- oba obb obc obg obi obk obn obo obr obs oc- oca ocb occ ocg oci ock ocn oco ocr ocs oga ogc ogg ogi ogn ogo ogs oia oib oic oii oik oin oio oir ois oka okb okc okg oki okk oko okr oks on- ona onb onc ong oni onk onn ono onr ons oo- ooa oob ooc oog ooi ook oon ooo oor oos or- ora orb orc org ori ork orn oro orr ors os- osa osb osc osg osi osk osn oso osr oss ra- raa rab rac rag rai rak ran rao rar ras rba rbb rbc rbg rbi rbk rbn rbo rbr rbs rca rcb rcc rcg rci rcn rco rcr rcs rga rgb rgc rgg rgi rgk rgn rgo rgr rgs ria rib ric rig rii rik rin rio rir ris rkb rkc rkg rkk rko rks rna rnb rnc rng rni rnn rno rnr rns roa rob roc rog roi rok ron roo ror ros rra rrb rrc rrg rri rrk rrn rrr rrs rsa rsb rsc rsg rsi rsk rsn rso rsr rss saa sab sac sag sai sak san sao sar sas sba sbb sbc sbg sbi sbk sbn sbo sbr sbs sca scb scc scg sci sck scn sco scr scs sga sgb sgc sgg sgi sgk sgn sgo sgr sgs sia sib sic sig sii sik sin sio sir sis sk- ska skb skc skg ski skk sko skr sks sna snb snc sng sni snk snn sno snr sns soa sob soc sog soi sok son soo sor sos sr- sra srb src srg sri srk srn sro srr srs ss- ssa ssb ssc ssg ssi ssk ssn sso ssr sss