-er a-a a-b aaa aab aae aag aah aao aar aau ab- aba abb abe abg abh abo abr abu aea aeb aee aeg aeh aeo aer aeu ag- aga agb age agg agh ago agr agu aha ahb ahe ahg ahh aho ahr ahu aoa aob aoe aog aoh aoo aor aou ar- ara arb are arg arh aro arr aru au- aua aub aue aug auh auo aur b-u baa bab bae bag bah bao bar bau bba bbb bbe bbg bbh bbo bbr bbu be- bea beb bee beg beh beo ber beu bga bgb bge bgg bgh bgo bgr bgu bha bhb bhe bhg bhh bho bhr bhu boa bob boe bog boh boo bor bou bra brb bre brg brh bro brr bru bua bub bue bug buh buo bur buu eaa eab eae eag eah eao ear eau eba ebb ebe ebg ebh ebo ebr ebu eea eeb eee eeg eeo eer ega egb ege egg egh ego egr egu eha ehb ehe ehg ehh eho ehr ehu eo- eoa eob eoe eog eoh eoo eor eou era erb ere erg erh ero err eru eu- eua eub eue eug eur gaa gab gae gag gah gao gar gau gba gbe gbg gbh gbo gbr gbu ge- gea geb gee geg geh geo ger geu gga ggb ggg ggh ggo ggr ggu gha ghb ghe ghg ghh gho ghr goa gob goe gog goh goo gor gou gra grb gre grg grh gro grr gru gu- gua gub gue gug guo gur guu haa hab hae hag hah hao har hau hba hbb hbe hbg hbh hbo hbr hbu he- hea heb hee heg heh heo her heu hga hgb hge hgg hgh hgo hgr hgu hha hhb hhe hhg hhh hho hhr hhu hoa hob hoe hog hoh hoo hor hou hr- hra hrb hre hrg hrh hro hrr hru hua hub hue hug huh huo hur huu oaa oab oae oag oah oao oar oau ob- oba obb obe obg obh obo obr obu oea oeb oee oeg oeh oeo oer oga oge ogg ogh ogo oha ohe ohg ohh oho ohr ohu oo- ooa oob oog ooh ooo oor or- ora orb ore org orh oro orr oru ou- oua oue ouh ouo our ra- raa rab rae rag rah rao rar rau rba rbb rbe rbg rbh rbo rbr rbu re- rea reb ree reg reh reo rer reu rga rgb rge rgg rgh rgo rgr rh- rha rhb rhe rhg rhh rho rhr rhu roa rob roe rog roh roo ror rou rra rrb rrg rrh rrr rru rua rub rue rug ruh ruo rur ruu ua- uaa uab uae uag uah uao uar uau uba ubb ube ubg ubh ubo ubr ubu uea ueb uee ueg ueh uer uga ugb uge ugg ugh ugo ugr ugu uha uhb uhe uhh uho uhr uhu uoa uob uoe uog uoo uor ur- ura urb ure urg uro urr uru uua uue uug uur uuu