a-a a-b aaa aab aae aag aan aao aas ab- aba abb abe abg abn abo abs aea aeb aee aeg aen aeo aes ag- aga agb age agg agn ago ags an- ana anb ane ang ann ano ans aoa aob aoe aog aon aoo aos as- asa asb ase asg asn aso ass baa bab bae bag ban bao bas bba bbb bbe bbg bbn bbo bbs be- bea beb bee beg ben beo bes bga bgb bge bgg bgn bgo bgs bna bnb bne bng bnn bno bns boa bob boe bog bon boo bos bsa bsb bse bsg bsn bso bss eaa eab eae eag ean eao eas eba ebb ebe ebg ebn ebo ebs eea eeb eee eeg een eeo ees ega egb ege egg egn ego egs en- ena enb ene eng enn eno ens eo- eoa eob eoe eog eon eoo eos es- esa esb ese esg esn eso ess gaa gab gae gag gan gao gas gba gbe gbg gbn gbo gbs ge- gea geb gee geg gen geo ges gga ggb ggg ggn ggo ggs gna gnb gne gnn gno gns goa gob goe gog gon goo gos gsa gsb gse gsg gsn gso gss naa nab nae nag nan nao nas nba nbb nbe nbg nbn nbo nbs ne- nea neb nee neg nen neo nes nga ngb nge ngg ngn ngo ngs nna nnb nne nng nnn nno nns no- noa nob noe nog non noo nos nsa nsb nse nsg nsn nso nss oaa oab oae oag oan oao oas ob- oba obb obe obg obn obo obs oea oeb oee oeg oen oeo oes oga oge ogg ogn ogo ogs on- ona onb one ong onn ono ons oo- ooa oob oog oon ooo oos os- osa osb ose osg osn oso oss saa sab sae sag san sao sas sba sbb sbe sbg sbn sbo sbs se- sea seb see seg sen seo ses sga sgb sge sgg sgn sgo sgs sna snb sne sng snn sno sns soa sob soe sog son soo sos ss- ssa ssb sse ssg ssn sso sss