-er a-a a-b a-i a-t aaa aab aad aae aai aao aar aat ab- aba abb abd abe abi abo abr abt ad- ada adb add ade adi ado adr adt aea aeb aed aee aei aeo aer aet ai- aia aib aid aie aii aio air ait aoa aob aod aoe aoi aoo aor aot ar- ara arb ard are ari aro arr art at- ata atb atd ate ati ato atr att baa bab bad bae bai bao bar bat bba bbb bbd bbe bbi bbo bbr bbt bda bdb bdd bde bdi bdo bdr bdt be- bea beb bed bee bei beo ber bet bi- bia bib bid bie bii bio bir bit boa bob bod boe boi boo bor bot bra brb brd bre bri bro brr brt bta btb btd bte bti bto btr btt daa dab dad dae dai dao dar dat dba dbb dbd dbe dbi dbo dbr dbt dda ddb ddd dde ddi ddo ddr ddt de- dea deb ded dee dei deo der det di- dia dib did die dii dio dir dit doa dob dod doe doi doo dor dot dra drb drd dre dri dro drr drt dta dtb dtd dte dti dto dtr dtt eaa eab ead eae eai eao ear eat eba ebb ebd ebe ebi ebo ebr ebt ed- eda edb edd ede edi edo edr edt eea eeb eed eee eeo eer eet eia eib eid eie eii eio eir eit eo- eoa eob eod eoe eoi eoo eor eot era erb erd ere eri ero err ert eta etb etd ete eti eto etr ett i-d ia- iaa iab iad iae iai iao iar iat iba ibb ibd ibe ibi ibo ibr ibt ida idb idd ide idi ido idr idt ie- iea ied iee iei ier iet iia iib iid iie iii iio iir iit io- ioa iob iod ioe ioi ioo ior iot ir- ira irb ird ire iri iro irr irt ita itb itd ite iti ito itt o-i oaa oab oad oae oai oao oar oat ob- oba obb obd obe obi obo obr obt oda odb odd ode odi odo odr odt oea oeb oed oee oei oeo oer oet oia oib oid oie oii oio oir oit oo- ooa oob ood ooi ooo oor oot or- ora orb ord ore ori oro orr ort ot- ota otb otd ote oti oto otr ott ra- raa rab rad rae rai rao rar rat rba rbb rbd rbe rbi rbo rbr rbt rda rdb rdd rde rdi rdo rdr rdt re- rea reb red ree rei reo rer ret ria rib rid rie rii rio rir rit roa rob rod roe roi roo ror rot rra rrb rrd rri rrr rrt rta rtb rtd rte rti rto rtr rtt taa tab tad tae tai tao tar tat tba tbb tbd tbe tbi tbo tbr tbt tda tdb tdd tde tdi tdo tdr tdt te- tea teb ted tee tei teo ter tet tia tib tid tie tii tio tir tit to- toa tob tod toe toi too tor tot tra trb trd tre tri tro trr trt tta ttb ttd tte tti tto ttr ttt