a-a a-b aaa aab aah aan aao aap ab- aba abb abh abn abo abp aha ahb ahh ahn aho ahp an- ana anb anh ann ano anp aoa aob aoh aon aoo aop ap- apa apb aph apn apo app b-p baa bab bah ban bao bap bba bbb bbh bbn bbo bbp bha bhb bhh bho bhp bna bnb bnn bno bnp boa bob boh bon boo bop bpa bpb bph bpn bpo bpp haa hab hah han hao hap hba hbb hbh hbn hbo hbp hha hhb hhh hhn hho hhp hna hnb hnh hnn hno hoa hob hoh hon hoo hop hpa hpb hph hpn hpo hpp naa nab nah nan nao nap nba nbb nbn nbo nbp nha nhb nhh nhn nhp nna nnb nnh nnn nno nnp no- noa nob noh non noo nop npa npb nph npn npo npp oaa oab oah oan oao oap ob- oba obb obh obn obo obp oha ohh ohn oho ohp on- ona onb onh onn ono onp oo- ooa oob ooh oon ooo oop op- opa opb oph opn opo opp p-p paa pab pah pan pao pap pba pbb pbn pbo pbp pha phb phn pho php pn- pna pnb pnh pnn pno pnp poa pob poh pon poo pop ppa ppb pph ppn ppo ppp