a-a a-b a-i aaa aab aag aai aak aao aap ab- aba abb abg abi abk abo abp ag- aga agb agg agi agk ago agp ai- aia aib aig aii aik aio aip aka akb akg aki akk ako akp aoa aob aog aoi aok aoo aop ap- apa apb apg api apk apo app b-p baa bab bag bai bak bao bap bba bbb bbg bbi bbk bbo bbp bga bgb bgg bgi bgk bgo bgp bi- bia bib big bii bik bio bip bka bkb bkg bkk bko bkp boa bob bog boi bok boo bop bpa bpb bpg bpi bpo bpp g-p gaa gab gag gai gak gao gap gba gbg gbi gbk gbo gbp gga ggb ggg ggi ggo ggp gia gib gig gii gik gio gip gka gkb gko gkp goa gob gog goi gok goo gop gpa gpb gpg gpi gpk gpo gpp ia- iaa iab iag iai iao iap iba ibb ibg ibi ibk ibo ibp iga igb igg igi igk igo igp iia iib iii iio iip ika ikb iki ikk iko io- ioa iob iog ioi ioo iop ipa ipb ipg ipi ipo ipp ka- kaa kab kag kai kak kao kap kba kbb kbi kbk kbo kbp kga kgb kgi kgo kgp kia kib kig kii kik kio kip kkb kki kkk kkp koa kob kog koi kok koo kop kpa kpi kpk kpo kpp o-i oaa oab oag oai oak oao oap ob- oba obb obg obi obk obo obp oga ogg ogi ogo ogp oia oib oii oik oio oip oka okb okg oki okk oko okp oo- ooa oob oog ooi ook ooo oop op- opa opb opg opi opk opo opp p-p paa pab pag pai pak pao pap pba pbb pbg pbi pbk pbo pbp pga pgb pgg pgi pgk pgo pgp pia pib pig pii pik pio pip pka pkb pkg pki pko pkp poa pob pog poi pok poo pop ppa ppb ppg ppi ppk ppo ppp