-er a-a a-b aaa aab aae aag aah aan aao aar ab- aba abb abe abg abh abn abo abr aea aeb aee aeg aeh aen aeo aer ag- aga agb age agg agh agn ago agr aha ahb ahe ahg ahh ahn aho ahr an- ana anb ane ang anh ann ano anr aoa aob aoe aog aoh aon aoo aor ar- ara arb are arg arh arn aro arr baa bab bae bag bah ban bao bar bba bbb bbe bbg bbh bbn bbo bbr be- bea beb bee beg beh ben beo ber bga bgb bge bgg bgh bgn bgo bgr bha bhb bhe bhg bhh bho bhr bna bnb bne bng bnn bno bnr boa bob boe bog boh bon boo bor bra brb bre brg brh brn bro brr eaa eab eae eag eah ean eao ear eba ebb ebe ebg ebh ebn ebo ebr eea eeb eee eeg een eeo eer ega egb ege egg egh egn ego egr eha ehb ehe ehg ehh ehn eho ehr en- ena enb ene eng enh enn eno enr eo- eoa eob eoe eog eoh eon eoo eor era erb ere erg erh ern ero err gaa gab gae gag gah gan gao gar gba gbe gbg gbh gbn gbo gbr ge- gea geb gee geg geh gen geo ger gga ggb ggg ggh ggn ggo ggr gha ghb ghe ghg ghh ghn gho ghr gna gnb gne gnn gno gnr goa gob goe gog goh gon goo gor gra grb gre grg grh grn gro grr haa hab hae hag hah han hao har hba hbb hbe hbg hbh hbn hbo hbr he- hea heb hee heg heh hen heo her hga hgb hge hgg hgh hgn hgo hgr hha hhb hhe hhg hhh hhn hho hhr hna hnb hne hng hnh hnn hno hoa hob hoe hog hoh hon hoo hor hr- hra hrb hre hrg hrh hrn hro hrr naa nab nae nag nah nan nao nar nba nbb nbe nbg nbn nbo nbr ne- nea neb nee neg neh nen neo ner nga ngb nge ngg ngh ngn ngo nha nhb nhe nhg nhh nhn nhr nna nnb nne nng nnh nnn nno no- noa nob noe nog noh non noo nor nra nrb nre nrg nrn nro nrr oaa oab oae oag oah oan oao oar ob- oba obb obe obg obh obn obo obr oea oeb oee oeg oeh oen oeo oer oga oge ogg ogh ogn ogo oha ohe ohg ohh ohn oho ohr on- ona onb one ong onh onn ono onr oo- ooa oob oog ooh oon ooo oor or- ora orb ore org orh orn oro orr ra- raa rab rae rag rah ran rao rar rba rbb rbe rbg rbh rbn rbo rbr re- rea reb ree reg reh ren reo rer rga rgb rge rgg rgh rgn rgo rgr rh- rha rhb rhe rhg rhh rhn rho rhr rna rnb rng rnh rnn rno rnr roa rob roe rog roh ron roo ror rra rrb rrg rrh rrn rrr