-er a-a a-b aaa aab aae aag aah aak aao aar ab- aba abb abe abg abh abk abo abr aea aeb aee aeg aeh aek aeo aer ag- aga agb age agg agh agk ago agr aha ahb ahe ahg ahh ahk aho ahr aka akb ake akg akh akk ako akr aoa aob aoe aog aoh aok aoo aor ar- ara arb are arg arh ark aro arr baa bab bae bag bah bak bao bar bba bbb bbe bbg bbh bbk bbo bbr be- bea beb bee beg beh bek beo ber bga bgb bge bgg bgh bgk bgo bgr bha bhb bhe bhg bhh bhk bho bhr bka bkb bke bkg bkk bko bkr boa bob boe bog boh bok boo bor bra brb bre brg brh brk bro brr eaa eab eae eag eah eak eao ear eba ebb ebe ebg ebh ebk ebo ebr eea eeb eee eeg eek eeo eer ega egb ege egg egh ego egr eha ehb ehe ehg ehh eho ehr eka ekb eke ekg ekh eko ekr eo- eoa eob eoe eog eoh eok eoo eor era erb ere erg erh erk ero err gaa gab gae gag gah gak gao gar gba gbe gbg gbh gbk gbo gbr ge- gea geb gee geg geh gek geo ger gga ggb ggg ggh ggo ggr gha ghb ghe ghg ghh gho ghr gka gkb gkh gko goa gob goe gog goh gok goo gor gra grb gre grg grh grk gro grr haa hab hae hag hah hak hao har hba hbb hbe hbg hbh hbk hbo hbr he- hea heb hee heg heh hek heo her hga hgb hge hgg hgh hgk hgo hgr hha hhb hhe hhg hhh hhk hho hhr hka hkb hkg hkh hkk hko hkr hoa hob hoe hog hoh hok hoo hor hr- hra hrb hre hrg hrh hrk hro hrr ka- kaa kab kae kag kah kak kao kar kba kbb kbe kbh kbk kbo kbr ke- kea keb kee keg keh kek keo ker kga kgb kgh kgo kha khe khh khk kho khr kkb kke kkh kkk kkr koa kob koe kog koh kok koo kor kra krg krk kro krr oaa oab oae oag oah oak oao oar ob- oba obb obe obg obh obk obo obr oea oeb oee oeg oeh oeo oer oga oge ogg ogh ogo oha ohe ohg ohh oho ohr oka okb oke okg okk oko okr oo- ooa oob oog ooh ook ooo oor or- ora orb ore org orh ork oro orr ra- raa rab rae rag rah rak rao rar rba rbb rbe rbg rbh rbk rbo rbr re- rea reb ree reg reh rek reo rer rga rgb rge rgg rgh rgk rgo rgr rh- rha rhb rhe rhg rhh rho rhr rkb rke rkg rkk rko roa rob roe rog roh rok roo ror rra rrb rrg rrh rrk rrr