a-a a-b aaa aab aag aak aao aap ab- aba abb abg abk abo abp ag- aga agb agg agk ago agp aka akb akg akk ako akp aoa aob aog aok aoo aop ap- apa apb apg apk apo app b-p baa bab bag bak bao bap bba bbb bbg bbk bbo bbp bga bgb bgg bgk bgo bgp bka bkb bkg bkk bko bkp boa bob bog bok boo bop bpa bpb bpg bpo bpp g-p gaa gab gag gak gao gap gba gbg gbk gbo gbp gga ggb ggg ggo ggp gka gkb gko gkp goa gob gog gok goo gop gpa gpb gpg gpk gpo gpp ka- kaa kab kag kak kao kap kba kbb kbk kbo kbp kga kgb kgo kgp kkb kkk kkp koa kob kog kok koo kop kpa kpk kpo kpp oaa oab oag oak oao oap ob- oba obb obg obk obo obp oga ogg ogo ogp oka okb okg okk oko okp oo- ooa oob oog ook ooo oop op- opa opb opg opk opo opp p-p paa pab pag pak pao pap pba pbb pbg pbk pbo pbp pga pgb pgg pgk pgo pgp pka pkb pkg pko pkp poa pob pog pok poo pop ppa ppb ppg ppk ppo ppp