-er a-a a-b aaa aab aad aae aag aah aao aar ab- aba abb abd abe abg abh abo abr ad- ada adb add ade adg adh ado adr aea aeb aed aee aeg aeh aeo aer ag- aga agb agd age agg agh ago agr aha ahb ahd ahe ahg ahh aho ahr aoa aob aod aoe aog aoh aoo aor ar- ara arb ard are arg arh aro arr baa bab bad bae bag bah bao bar bba bbb bbd bbe bbg bbh bbo bbr bda bdb bdd bde bdg bdh bdo bdr be- bea beb bed bee beg beh beo ber bga bgb bgd bge bgg bgh bgo bgr bha bhb bhd bhe bhg bhh bho bhr boa bob bod boe bog boh boo bor bra brb brd bre brg brh bro brr daa dab dad dae dag dah dao dar dba dbb dbd dbe dbg dbh dbo dbr dda ddb ddd dde ddg ddh ddo ddr de- dea deb ded dee deg deh deo der dga dgd dge dgg dgh dgr dh- dha dhb dhd dhe dhh dho dhr doa dob dod doe dog doh doo dor dra drb drd dre drg dro drr eaa eab ead eae eag eah eao ear eba ebb ebd ebe ebg ebh ebo ebr ed- eda edb edd ede edg edh edo edr eea eeb eed eee eeg eeo eer ega egb egd ege egg egh ego egr eha ehb ehd ehe ehg ehh eho ehr eo- eoa eob eod eoe eog eoh eoo eor era erb erd ere erg erh ero err g-d gaa gab gad gae gag gah gao gar gba gbd gbe gbg gbh gbo gbr gda gdb gdd gde gdh gdo gdr ge- gea geb ged gee geg geh geo ger gga ggb ggd ggg ggh ggo ggr gha ghb ghd ghe ghg ghh gho ghr goa gob god goe gog goh goo gor gra grb grd gre grg grh gro grr haa hab had hae hag hah hao har hba hbb hbd hbe hbg hbh hbo hbr hda hdb hdd hde hdg hdh hdo hdr he- hea heb hed hee heg heh heo her hga hgb hge hgg hgh hgo hgr hha hhb hhd hhe hhg hhh hho hhr hoa hob hod hoe hog hoh hoo hor hr- hra hrb hrd hre hrg hrh hro hrr oaa oab oad oae oag oah oao oar ob- oba obb obd obe obg obh obo obr oda odb odd ode odg odh odo odr oea oeb oed oee oeg oeh oeo oer oga ogd oge ogg ogh ogo oha ohd ohe ohg ohh oho ohr oo- ooa oob ood oog ooh ooo oor or- ora orb ord ore org orh oro orr ra- raa rab rad rae rag rah rao rar rba rbb rbd rbe rbg rbh rbo rbr rda rdb rdd rde rdg rdh rdo rdr re- rea reb red ree reg reh reo rer rga rgb rgd rge rgg rgh rgo rgr rh- rha rhb rhd rhe rhg rhh rho rhr roa rob rod roe rog roh roo ror rra rrb rrd rrg rrh rrr