a-a a-b aaa aab aad aah aan aao aar ab- aba abb abd abh abn abo abr ad- ada adb add adh adn ado adr aha ahb ahd ahh ahn aho ahr an- ana anb and anh ann ano anr aoa aob aod aoh aon aoo aor ar- ara arb ard arh arn aro arr baa bab bad bah ban bao bar bba bbb bbd bbh bbn bbo bbr bda bdb bdd bdh bdo bdr bha bhb bhd bhh bho bhr bna bnb bnd bnn bno bnr boa bob bod boh bon boo bor bra brb brd brh brn bro brr daa dab dad dah dan dao dar dba dbb dbd dbh dbn dbo dbr dda ddb ddd ddh ddn ddo ddr dh- dha dhb dhd dhh dho dhr dna dnb dnd dnh dnn dno dnr doa dob dod doh don doo dor dra drb drd drn dro drr haa hab had hah han hao har hba hbb hbd hbh hbn hbo hbr hda hdb hdd hdh hdn hdo hdr hha hhb hhd hhh hhn hho hhr hna hnb hnd hnh hnn hno hoa hob hod hoh hon hoo hor hr- hra hrb hrd hrh hrn hro hrr naa nab nad nah nan nao nar nba nbb nbd nbn nbo nbr nda ndb ndd ndh ndn ndo ndr nha nhb nhd nhh nhn nhr nna nnb nnh nnn nno no- noa nob nod noh non noo nor nra nrb nrd nrn nro nrr oaa oab oad oah oan oao oar ob- oba obb obd obh obn obo obr oda odb odd odh odn odo odr oha ohd ohh ohn oho ohr on- ona onb ond onh onn ono onr oo- ooa oob ood ooh oon ooo oor or- ora orb ord orh orn oro orr ra- raa rab rad rah ran rao rar rba rbb rbd rbh rbn rbo rbr rda rdb rdd rdh rdn rdo rdr rh- rha rhb rhd rhh rhn rho rhr rna rnb rnd rnh rnn rno rnr roa rob rod roh ron roo ror rra rrb rrd rrh rrn rrr