-er a-a a-b aaa aab aad aae aah aao aar aav ab- aba abb abd abe abh abo abr abv ad- ada adb add ade adh ado adr adv aea aeb aed aee aeh aeo aer aev aha ahb ahd ahe ahh aho ahr ahv aoa aob aod aoe aoh aoo aor aov ar- ara arb ard are arh aro arr arv av- ava avb avd ave avh avo avr baa bab bad bae bah bao bar bav bba bbb bbd bbe bbh bbo bbr bda bdb bdd bde bdh bdo bdr bdv be- bea beb bed bee beh beo ber bev bha bhb bhd bhe bhh bho bhr bhv boa bob bod boe boh boo bor bov bra brb brd bre brh bro brr brv bva bvb bvd bve bvh bvo bvr bvv daa dab dad dae dah dao dar dav dba dbb dbd dbe dbh dbo dbr dbv dda ddb ddd dde ddh ddo ddr de- dea deb ded dee deh deo der dev dh- dha dhb dhd dhe dhh dho dhr doa dob dod doe doh doo dor dov dra drb drd dre dro drr drv dva dvb dvd dve dvh dvr eaa eab ead eae eah eao ear eav eba ebb ebd ebe ebh ebo ebr ebv ed- eda edb edd ede edh edo edr eea eeb eed eee eeo eer eev eha ehb ehd ehe ehh eho ehr ehv eo- eoa eob eod eoe eoh eoo eor era erb erd ere erh ero err erv eva evb evd eve evh evo evr evv haa hab had hae hah hao har hav hba hbb hbd hbe hbh hbo hbr hbv hda hdb hdd hde hdh hdo hdr hdv he- hea heb hed hee heh heo her hev hha hhb hhd hhe hhh hho hhr hhv hoa hob hod hoe hoh hoo hor hov hr- hra hrb hrd hre hrh hro hrr hrv hv- hva hvb hvd hvo hvr hvv oaa oab oad oae oah oao oar oav ob- oba obb obd obe obh obo obr obv oda odb odd ode odh odo odr odv oea oeb oed oee oeh oeo oer oha ohd ohe ohh oho ohr oo- ooa oob ood ooh ooo oor oov or- ora orb ord ore orh oro orr orv ov- ova ovb ovd ove ovh ovo ovv ra- raa rab rad rae rah rao rar rav rba rbb rbd rbe rbh rbo rbr rda rdb rdd rde rdh rdo rdr rdv re- rea reb red ree reh reo rer rev rh- rha rhb rhd rhe rhh rho rhr rhv roa rob rod roe roh roo ror rov rra rrb rrd rrh rrr rva rvb rvd rve rvh rvo rvr rvv v-a v-e vaa vab vad vae vah vao var vav vba vbd vbh vbo vbr vbv vdb vdd vde vdh vdo vdr vdv vea veb ved vee veh veo ver vh- vha vhb vhd vhe vho voa vob vod voe voh voo vor vov vra vrb vrd vre vrh vrr vva vvb vvo vvr vvv