-er a-a a-b aaa aab aae aah aak aan aao aar ab- aba abb abe abh abk abn abo abr aea aeb aee aeh aek aen aeo aer aha ahb ahe ahh ahk ahn aho ahr aka akb ake akh akk akn ako akr an- ana anb ane anh ank ann ano anr aoa aob aoe aoh aok aon aoo aor ar- ara arb are arh ark arn aro arr baa bab bae bah bak ban bao bar bba bbb bbe bbh bbk bbn bbo bbr be- bea beb bee beh bek ben beo ber bha bhb bhe bhh bhk bho bhr bka bkb bke bkk bkn bko bkr bna bnb bne bnk bnn bno bnr boa bob boe boh bok bon boo bor bra brb bre brh brk brn bro brr eaa eab eae eah eak ean eao ear eba ebb ebe ebh ebk ebn ebo ebr eea eeb eee eek een eeo eer eha ehb ehe ehh ehn eho ehr eka ekb eke ekh eko ekr en- ena enb ene enh enk enn eno enr eo- eoa eob eoe eoh eok eon eoo eor era erb ere erh erk ern ero err haa hab hae hah hak han hao har hba hbb hbe hbh hbk hbn hbo hbr he- hea heb hee heh hek hen heo her hha hhb hhe hhh hhk hhn hho hhr hka hkb hkh hkk hkn hko hkr hna hnb hne hnh hnk hnn hno hoa hob hoe hoh hok hon hoo hor hr- hra hrb hre hrh hrk hrn hro hrr ka- kaa kab kae kah kak kan kao kar kba kbb kbe kbh kbk kbn kbo kbr ke- kea keb kee keh kek ken keo ker kha khe khh khk khn kho khr kkb kke kkh kkk kkn kkr kn- kna kne knk knn kno knr koa kob koe koh kok kon koo kor kra krk krn kro krr naa nab nae nah nak nan nao nar nba nbb nbe nbk nbn nbo nbr ne- nea neb nee neh nek nen neo ner nha nhb nhe nhh nhk nhn nhr nka nke nkk nkn nko nkr nna nnb nne nnh nnk nnn nno no- noa nob noe noh nok non noo nor nra nrb nre nrk nrn nro nrr oaa oab oae oah oak oan oao oar ob- oba obb obe obh obk obn obo obr oea oeb oee oeh oen oeo oer oha ohe ohh ohn oho ohr oka okb oke okk oko okr on- ona onb one onh onk onn ono onr oo- ooa oob ooh ook oon ooo oor or- ora orb ore orh ork orn oro orr ra- raa rab rae rah rak ran rao rar rba rbb rbe rbh rbk rbn rbo rbr re- rea reb ree reh rek ren reo rer rh- rha rhb rhe rhh rhn rho rhr rkb rke rkk rko rna rnb rnh rnn rno rnr roa rob roe roh rok ron roo ror rra rrb rrh rrk rrn rrr