-er a-a a-b a-i aaa aab aad aae aai aao aar aav ab- aba abb abd abe abi abo abr abv ad- ada adb add ade adi ado adr adv aea aeb aed aee aei aeo aer aev ai- aia aib aid aie aii aio air aiv aoa aob aod aoe aoi aoo aor aov ar- ara arb ard are ari aro arr arv av- ava avb avd ave avi avo avr baa bab bad bae bai bao bar bav bba bbb bbd bbe bbi bbo bbr bda bdb bdd bde bdi bdo bdr bdv be- bea beb bed bee bei beo ber bev bi- bia bib bid bie bii bio bir biv boa bob bod boe boi boo bor bov bra brb brd bre bri bro brr brv bva bvb bvd bve bvi bvo bvr bvv daa dab dad dae dai dao dar dav dba dbb dbd dbe dbi dbo dbr dbv dda ddb ddd dde ddi ddo ddr de- dea deb ded dee dei deo der dev di- dia dib did die dii dio dir div doa dob dod doe doi doo dor dov dra drb drd dre dri dro drr drv dva dvb dvd dve dvi dvr eaa eab ead eae eai eao ear eav eba ebb ebd ebe ebi ebo ebr ebv ed- eda edb edd ede edi edo edr eea eeb eed eee eeo eer eev eia eib eid eie eii eio eir eiv eo- eoa eob eod eoe eoi eoo eor era erb erd ere eri ero err erv eva evb evd eve evi evo evr evv i-d i-v ia- iaa iab iad iae iai iao iar iav iba ibb ibd ibe ibi ibo ibr ibv ida idb idd ide idi ido idr idv ie- iea ied iee iei ier iev iia iib iid iie iii iio iir io- ioa iob iod ioe ioi ioo ior iov ir- ira irb ird ire iri iro irr irv iva ivb ivd ive ivi ivo ivr ivv o-i oaa oab oad oae oai oao oar oav ob- oba obb obd obe obi obo obr obv oda odb odd ode odi odo odr odv oea oeb oed oee oei oeo oer oia oib oid oie oii oio oir oiv oo- ooa oob ood ooi ooo oor oov or- ora orb ord ore ori oro orr orv ov- ova ovb ovd ove ovi ovo ovv ra- raa rab rad rae rai rao rar rav rba rbb rbd rbe rbi rbo rbr rda rdb rdd rde rdi rdo rdr rdv re- rea reb red ree rei reo rer rev ria rib rid rie rii rio rir riv roa rob rod roe roi roo ror rov rra rrb rrd rri rrr rva rvb rvd rve rvi rvo rvr rvv v-a v-e vaa vab vad vae vai vao var vav vba vbd vbi vbo vbr vbv vdb vdd vde vdi vdo vdr vdv vea veb ved vee vei veo ver vi- via vib vid vie vii vio vir viv voa vob vod voe voi voo vor vov vra vrb vrd vre vri vrr vva vvb vvi vvo vvr vvv