-er a-a a-b a-i a-t aaa aab aad aae aai aak aao aar aat aav ab- aba abb abd abe abi abk abo abr abt abv ad- ada adb add ade adi adk ado adr adt adv aea aeb aed aee aei aek aeo aer aet aev ai- aia aib aid aie aii aik aio air ait aiv aka akb akd ake aki akk ako akr akv aoa aob aod aoe aoi aok aoo aor aot aov ar- ara arb ard are ari ark aro arr art arv at- ata atb atd ate ati ato atr att atv av- ava avb avd ave avi avk avo avr avt baa bab bad bae bai bak bao bar bat bav bba bbb bbd bbe bbi bbk bbo bbr bbt bda bdb bdd bde bdi bdk bdo bdr bdt bdv be- bea beb bed bee bei bek beo ber bet bev bi- bia bib bid bie bii bik bio bir bit biv bka bkb bke bkk bko bkr bkt bkv boa bob bod boe boi bok boo bor bot bov bra brb brd bre bri brk bro brr brt brv bta btb btd bte bti btk bto btr btt btv bva bvb bvd bve bvi bvk bvo bvr bvt bvv daa dab dad dae dai dak dao dar dat dav dba dbb dbd dbe dbi dbk dbo dbr dbt dbv dda ddb ddd dde ddi ddk ddo ddr ddt de- dea deb ded dee dei dek deo der det dev di- dia dib did die dii dik dio dir dit div dka dkb dke dki dkk dko dkr dkt doa dob dod doe doi dok doo dor dot dov dra drb drd dre dri drk dro drr drt drv dta dtb dtd dte dti dtk dto dtr dtt dtv dva dvb dvd dve dvi dvk dvr dvt eaa eab ead eae eai eak eao ear eat eav eba ebb ebd ebe ebi ebk ebo ebr ebt ebv ed- eda edb edd ede edi edk edo edr edt eea eeb eed eee eek eeo eer eet eev eia eib eid eie eii eik eio eir eit eiv eka ekb ekd eke eki eko ekr ekt ekv eo- eoa eob eod eoe eoi eok eoo eor eot era erb erd ere eri erk ero err ert erv eta etb etd ete eti etk 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 ibk ibo ibr ibt ibv ida idb idd ide idi idk ido idr idt idv ie- iea ied iee iei iek ier iet iev iia iib iid iie iii iio iir iit ika ikb ike iki ikk iko ikr ikt ikv io- ioa iob iod ioe ioi ioo ior iot iov ir- ira irb ird ire iri irk iro irr irt irv ita itb itd ite iti itk ito itt itv iva ivb ivd ive ivi ivo ivr ivt ivv k-t ka- kaa kab kad kae kai kak kao kar kat kav kba kbb kbd kbe kbi kbk kbo kbr kda kdb kde kdk kdo kdr kdt ke- kea keb ked kee kei kek keo ker ket kev kia kib kid kie kii kik kio kir kit kiv kkb kke kki kkk kkr kkt kkv koa kob kod koe koi kok koo kor kot kra krd kri krk kro krr krt krv kta ktb kte ktk kto ktr ktt ktv kva kvb kvi kvk kvo kvr kvv o-i oaa oab oad oae oai oak oao oar oat oav ob- oba obb obd obe obi obk 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 oik oio oir oit oiv oka okb okd oke oki okk oko okr oo- ooa oob ood ooi ook ooo oor oot oov or- ora orb ord ore ori ork oro orr ort orv ot- ota otb otd ote oti otk oto otr ott otv ov- ova ovb ovd ove ovi ovo ovv ra- raa rab rad rae rai rak rao rar rat rav rba rbb rbd rbe rbi rbk rbo rbr rbt rda rdb rdd rde rdi rdo rdr rdt rdv re- rea reb red ree rei rek reo rer ret rev ria rib rid rie rii rik rio rir rit riv rkb rke rkk rko rkt rkv roa rob rod roe roi rok roo ror rot rov rra rrb rrd rri rrk rrr rrt rta rtb rtd rte rti rtk rto rtr rtt rtv rva rvb rvd rve rvi rvo rvr rvt rvv taa tab tad tae tai tak tao tar tat tav tba tbb tbd tbe tbi tbk tbo tbr tbt tbv tda tdb tdd tde tdi tdk tdo tdr tdt tdv te- tea teb ted tee tei tek teo ter tet tev tia tib tid tie tii tik tio tir tit tiv tka tkb tke tkk tko tkr tkt to- toa tob tod toe toi tok too tor tot tov tra trb trd tre tri trk tro trr trt trv tta ttb ttd tte tti ttk tto ttr ttt ttv tva tvb tvd tve tvi tvk tvo tvr tvt v-a v-e vaa vab vad vae vai vak vao var vat vav vba vbd vbi vbk vbo vbr vbv vdb vdd vde vdi vdk vdo vdr vdt vdv vea veb ved vee vei vek veo ver vet vi- via vib vid vie vii vik vio vir vit viv vka vkb vkt voa vob vod voe voi vok voo vor vot vov vra vrb vrd vre vri vrk vrr vrt vta vtb vte vti vtk vto vtr vtt vtv vva vvb vvi vvo vvr vvt vvv