-er a-a a-b aaa aab aad aae aah aao aar ab- aba abb abd abe abh abo abr ad- ada adb add ade adh ado adr aea aeb aed aee aeh aeo aer aha ahb ahd ahe ahh aho ahr aoa aob aod aoe aoh aoo aor ar- ara arb ard are arh aro arr baa bab bad bae bah bao bar bba bbb bbd bbe bbh bbo bbr bda bdb bdd bde bdh bdo bdr be- bea beb bed bee beh beo ber bha bhb bhd bhe bhh bho bhr boa bob bod boe boh boo bor bra brb brd bre brh bro brr daa dab dad dae dah dao dar dba dbb dbd dbe dbh dbo dbr dda ddb ddd dde ddh ddo ddr de- dea deb ded dee deh deo der dh- dha dhb dhd dhe dhh dho dhr doa dob dod doe doh doo dor dra drb drd dre dro drr eaa eab ead eae eah eao ear eba ebb ebd ebe ebh ebo ebr ed- eda edb edd ede edh edo edr eea eeb eed eee eeo eer eha ehb ehd ehe ehh eho ehr eo- eoa eob eod eoe eoh eoo eor era erb erd ere erh ero err haa hab had hae hah hao har hba hbb hbd hbe hbh hbo hbr hda hdb hdd hde hdh hdo hdr he- hea heb hed hee heh heo her hha hhb hhd hhe hhh hho hhr hoa hob hod hoe hoh hoo hor hr- hra hrb hrd hre hrh hro hrr oaa oab oad oae oah oao oar ob- oba obb obd obe obh obo obr oda odb odd ode odh odo odr oea oeb oed oee oeh oeo oer oha ohd ohe ohh oho ohr oo- ooa oob ood ooh ooo oor or- ora orb ord ore orh oro orr ra- raa rab rad rae rah rao rar rba rbb rbd rbe rbh rbo rbr rda rdb rdd rde rdh rdo rdr re- rea reb red ree reh reo rer rh- rha rhb rhd rhe rhh rho rhr roa rob rod roe roh roo ror rra rrb rrd rrh rrr