a-a a-b a-i aaa aab aae aag aai aak aan aas ab- aba abb abe abg abi abk abn abs aea aeb aee aeg aei aek aen aes ag- aga agb age agg agi agk agn ags ai- aia aib aie aig aii aik ain ais aka akb ake akg aki akk akn aks an- ana anb ane ang ani ank ann ans as- asa asb ase asg asi ask asn ass baa bab bae bag bai bak ban bas bba bbb bbe bbg bbi bbk bbn bbs be- bea beb bee beg bei bek ben bes bga bgb bge bgg bgi bgk bgn bgs bi- bia bib bie big bii bik bin bis bka bkb bke bkg bkk bkn bks bna bnb bne bng bni bnk bnn bns bsa bsb bse bsg bsi bsk bsn bss eaa eab eae eag eai eak ean eas eba ebb ebe ebg ebi ebk ebn ebs eea eeb eee eeg eek een ees ega egb ege egg egi egn egs eia eib eie eig eii eik ein eis eka ekb eke ekg eki eks en- ena enb ene eng eni enk enn ens es- esa esb ese esg esi esk esn ess gaa gab gae gag gai gak gan gas gba gbe gbg gbi gbk gbn gbs ge- gea geb gee geg gei gek gen ges gga ggb ggg ggi ggn ggs gia gib gie gig gii gik gin gis gka gkb gkn gks gna gnb gne gni gnn gns gsa gsb gse gsg gsi gsk gsn gss ia- iaa iab iae iag iai ian ias iba ibb ibe ibg ibi ibk ibn ibs ie- iea iee ieg iei iek ien ies iga igb ige igg igi igk ign igs iia iib iie iii iin iis ika ikb ike iki ikk iks in- ina inb ine ing ini ink inn ins is- isa isb ise isg isi isk isn iss ka- kaa kab kae kag kai kak kan kas kba kbb kbe kbi kbk kbn kbs ke- kea keb kee keg kei kek ken kes kga kgb kgi kgs kia kib kie kig kii kik kin kis kkb kke kki kkk kkn kks kn- kna kne kng kni knk knn ksa ksb kse ksg ksi ksk ksn kss n-i naa nab nae nag nai nak nan nas nba nbb nbe nbg nbi nbk nbn nbs ne- nea neb nee neg nei nek nen nes nga ngb nge ngg ngi ngk ngn ngs nia nib nie nig nii nik nin nis nka nke nki nkk nkn nks nna nnb nne nng nni nnk nnn nns nsa nsb nse nsg nsi nsk nsn nss saa sab sae sag sai sak san sas sba sbb sbe sbg sbi sbk sbn sbs se- sea seb see seg sei sek sen ses sga sgb sge sgg sgi sgk sgn sgs sia sib sie sig sii sik sin sis sk- ska skb ske skg ski skk sks sna snb sne sng sni snk snn sns ss- ssa ssb sse ssg ssi ssk ssn sss