-er a-a a-b a-i a-t aaa aab aad aae aai aao aar aat aav ab- aba abb abd abe abi abo abr abt abv ad- ada adb add ade adi ado adr adt adv aea aeb aed aee aei aeo aer aet aev ai- aia aib aid aie aii aio air ait aiv aoa aob aod aoe aoi aoo aor aot aov ar- ara arb ard are ari aro arr art arv at- ata atb atd ate ati ato atr att atv av- ava avb avd ave avi avo avr avt baa bab bad bae bai bao bar bat bav bba bbb bbd bbe bbi bbo bbr bbt bda bdb bdd bde bdi bdo bdr bdt bdv be- bea beb bed bee bei beo ber bet bev bi- bia bib bid bie bii bio bir bit biv boa bob bod boe boi boo bor bot bov bra brb brd bre bri bro brr brt brv bta btb btd bte bti bto btr btt btv bva bvb bvd bve bvi bvo bvr bvt bvv daa dab dad dae dai dao dar dat dav dba dbb dbd dbe dbi dbo dbr dbt dbv dda ddb ddd dde ddi ddo ddr ddt de- dea deb ded dee dei deo der det dev di- dia dib did die dii dio dir dit div doa dob dod doe doi doo dor dot dov dra drb drd dre dri dro drr drt drv dta dtb dtd dte dti dto dtr dtt dtv dva dvb dvd dve dvi dvr dvt eaa eab ead eae eai eao ear eat eav eba ebb ebd ebe ebi ebo ebr ebt ebv ed- eda edb edd ede edi edo edr edt eea eeb eed eee eeo eer eet eev eia eib eid eie eii eio eir eit eiv eo- eoa eob eod eoe eoi eoo eor eot era erb erd ere eri ero err ert erv eta etb etd ete eti eto etr ett etv eva evb evd eve evi evo evr evt evv i-d i-v ia- iaa iab iad iae iai iao iar iat iav iba ibb ibd ibe ibi ibo ibr ibt ibv ida idb idd ide idi ido idr idt idv ie- iea ied iee iei ier iet iev iia iib iid iie iii iio iir iit io- ioa iob iod ioe ioi ioo ior iot iov ir- ira irb ird ire iri iro irr irt irv ita itb itd ite iti ito itt itv iva ivb ivd ive ivi ivo ivr ivt ivv o-i oaa oab oad oae oai oao oar oat oav ob- oba obb obd obe obi obo obr obt obv oda odb odd ode odi odo odr odt odv oea oeb oed oee oei oeo oer oet oia oib oid oie oii oio oir oit oiv oo- ooa oob ood ooi ooo oor oot oov or- ora orb ord ore ori oro orr ort orv ot- ota otb otd ote oti oto otr ott otv ov- ova ovb ovd ove ovi ovo ovv ra- raa rab rad rae rai rao rar rat rav rba rbb rbd rbe rbi rbo rbr rbt rda rdb rdd rde rdi rdo rdr rdt rdv re- rea reb red ree rei reo rer ret rev ria rib rid rie rii rio rir rit riv roa rob rod roe roi roo ror rot rov rra rrb rrd rri rrr rrt rta rtb rtd rte rti rto rtr rtt rtv rva rvb rvd rve rvi rvo rvr rvt rvv taa tab tad tae tai tao tar tat tav tba tbb tbd tbe tbi tbo tbr tbt tbv tda tdb tdd tde tdi tdo tdr tdt tdv te- tea teb ted tee tei teo ter tet tev tia tib tid tie tii tio tir tit tiv to- toa tob tod toe toi too tor tot tov tra trb trd tre tri tro trr trt trv tta ttb ttd tte tti tto ttr ttt ttv tva tvb tvd tve tvi tvo tvr tvt v-a v-e vaa vab vad vae vai vao var vat vav vba vbd vbi vbo vbr vbv vdb vdd vde vdi vdo vdr vdt vdv vea veb ved vee vei veo ver vet vi- via vib vid vie vii vio vir vit viv voa vob vod voe voi voo vor vot vov vra vrb vrd vre vri vrr vrt vta vtb vte vti vto vtr vtt vtv vva vvb vvi vvo vvr vvt vvv