a-a a-b aaa aab aad aah aak aan aao aar ab- aba abb abd abh abk abn abo abr ad- ada adb add adh adk adn ado adr aha ahb ahd ahh ahk ahn aho ahr aka akb akd akh akk akn ako akr an- ana anb and anh ank ann ano anr aoa aob aod aoh aok aon aoo aor ar- ara arb ard arh ark arn aro arr baa bab bad bah bak ban bao bar bba bbb bbd bbh bbk bbn bbo bbr bda bdb bdd bdh bdk bdo bdr bha bhb bhd bhh bhk bho bhr bka bkb bkk bkn bko bkr bna bnb bnd bnk bnn bno bnr boa bob bod boh bok bon boo bor bra brb brd brh brk brn bro brr daa dab dad dah dak dan dao dar dba dbb dbd dbh dbk dbn dbo dbr dda ddb ddd ddh ddk ddn ddo ddr dh- dha dhb dhd dhh dhk dho dhr dka dkb dkk dko dkr dna dnb dnd dnh dnk dnn dno dnr doa dob dod doh dok don doo dor dra drb drd drk drn dro drr haa hab had hah hak han hao har hba hbb hbd hbh hbk hbn hbo hbr hda hdb hdd hdh hdk hdn hdo hdr hha hhb hhd hhh hhk hhn hho hhr hka hkb hkd hkh hkk hkn hko hkr hna hnb hnd hnh hnk hnn hno hoa hob hod hoh hok hon hoo hor hr- hra hrb hrd hrh hrk hrn hro hrr ka- kaa kab kad kah kak kan kao kar kba kbb kbd kbh kbk kbn kbo kbr kda kdb kdh kdk kdo kdr kha khh khk khn kho khr kkb kkh kkk kkn kkr kn- kna knd knk knn kno knr koa kob kod koh kok kon koo kor kra krd krk krn kro krr naa nab nad nah nak nan nao nar nba nbb nbd nbk nbn nbo nbr nda ndb ndd ndh ndk ndn ndo ndr nha nhb nhd nhh nhk nhn nhr nka nkk nkn nko nkr nna nnb nnh nnk nnn nno no- noa nob nod noh nok non noo nor nra nrb nrd nrk nrn nro nrr oaa oab oad oah oak oan oao oar ob- oba obb obd obh obk obn obo obr oda odb odd odh odn odo odr oha ohd ohh ohn oho ohr oka okb okd okk oko okr on- ona onb ond onh onk onn ono onr oo- ooa oob ood ooh ook oon ooo oor or- ora orb ord orh ork orn oro orr ra- raa rab rad rah rak ran rao rar rba rbb rbd rbh rbk rbn rbo rbr rda rdb rdd rdh rdn rdo rdr rh- rha rhb rhd rhh rhn rho rhr rkb rkk rko rna rnb rnd rnh rnn rno rnr roa rob rod roh rok ron roo ror rra rrb rrd rrh rrk rrn rrr