a-a a-b aaa aab aag aah aan aao aar ab- aba abb abg abh abn abo abr ag- aga agb agg agh agn ago agr aha ahb ahg ahh ahn aho ahr an- ana anb ang anh ann ano anr aoa aob aog aoh aon aoo aor ar- ara arb arg arh arn aro arr baa bab bag bah ban bao bar bba bbb bbg bbh bbn bbo bbr bga bgb bgg bgh bgn bgo bgr bha bhb bhg bhh bho bhr bna bnb bng bnn bno bnr boa bob bog boh bon boo bor bra brb brg brh brn bro brr gaa gab gag gah gan gao gar gba gbg gbh gbn gbo gbr gga ggb ggg ggh ggn ggo ggr gha ghb ghg ghh ghn gho ghr gna gnb gnn gno gnr goa gob gog goh gon goo gor gra grb grg grh grn gro grr haa hab hag hah han hao har hba hbb hbg hbh hbn hbo hbr hga hgb hgg hgh hgn hgo hgr hha hhb hhg hhh hhn hho hhr hna hnb hng hnh hnn hno hoa hob hog hoh hon hoo hor hr- hra hrb hrg hrh hrn hro hrr naa nab nag nah nan nao nar nba nbb nbg nbn nbo nbr nga ngb ngg ngh ngn ngo nha nhb nhg nhh nhn nhr nna nnb nng nnh nnn nno no- noa nob nog noh non noo nor nra nrb nrg nrn nro nrr oaa oab oag oah oan oao oar ob- oba obb obg obh obn obo obr oga ogg ogh ogn ogo oha ohg ohh ohn oho ohr on- ona onb ong onh onn ono onr oo- ooa oob oog ooh oon ooo oor or- ora orb org orh orn oro orr ra- raa rab rag rah ran rao rar rba rbb rbg rbh rbn rbo rbr rga rgb rgg rgh rgn rgo rgr rh- rha rhb rhg rhh rhn rho rhr rna rnb rng rnh rnn rno rnr roa rob rog roh ron roo ror rra rrb rrg rrh rrn rrr