-er a-a a-b a-i a-t aaa aab aae aag aai aao aar aat aav ab- aba abb abe abg abi abo abr abt abv aea aeb aee aeg aei aeo aer aet aev ag- aga agb age agg agi ago agr agt agv ai- aia aib aie aig aii aio air ait aiv aoa aob aoe aog aoi aoo aor aot aov ar- ara arb are arg ari aro arr art arv at- ata atb ate atg ati ato atr att atv av- ava avb ave avg avi avo avr avt baa bab bae bag bai bao bar bat bav bba bbb bbe bbg bbi bbo bbr bbt be- bea beb bee beg bei beo ber bet bev bga bgb bge bgg bgi bgo bgr bgt bgv bi- bia bib bie big bii bio bir bit biv boa bob boe bog boi boo bor bot bov bra brb bre brg bri bro brr brt brv bta btb bte btg bti bto btr btt btv bva bvb bve bvg bvi bvo bvr bvt bvv eaa eab eae eag eai eao ear eat eav eba ebb ebe ebg ebi ebo ebr ebt ebv eea eeb eee eeg eeo eer eet eev ega egb ege egg egi ego egr egt eia eib eie eig eii eio eir eit eiv eo- eoa eob eoe eog eoi eoo eor eot era erb ere erg eri ero err ert erv eta etb ete etg eti eto etr ett etv eva evb eve evg evi evo evr evt evv gaa gab gae gag gai gao gar gat gav gba gbe gbg gbi gbo gbr gbt gbv ge- gea geb gee geg gei geo ger get gev gga ggb ggg ggi ggo ggr ggt ggv gia gib gie gig gii gio gir git giv goa gob goe gog goi goo gor got gov gra grb gre grg gri gro grr grt grv gta gtb gte gtg gti gto gtr gtt gtv gva gvb gve gvg gvi gvo gvr gvt i-v ia- iaa iab iae iag iai iao iar iat iav iba ibb ibe ibg ibi ibo ibr ibt ibv ie- iea iee ieg iei ier iet iev iga igb ige igg igi igo igr igt iia iib iie iii iio iir iit io- ioa iob ioe iog ioi ioo ior iot iov ir- ira irb ire irg iri iro irr irt irv ita itb ite itg iti ito itt itv iva ivb ive ivg ivi ivo ivr ivt ivv o-i oaa oab oae oag oai oao oar oat oav ob- oba obb obe obg obi obo obr obt obv oea oeb oee oeg oei oeo oer oet oga oge ogg ogi ogo ogt oia oib oie oii oio oir oit oiv oo- ooa oob oog ooi ooo oor oot oov or- ora orb ore org ori oro orr ort orv ot- ota otb ote otg oti oto otr ott otv ov- ova ovb ove ovi ovo ovv ra- raa rab rae rag rai rao rar rat rav rba rbb rbe rbg rbi rbo rbr rbt re- rea reb ree reg rei reo rer ret rev rga rgb rge rgg rgi rgo rgr rgt rgv ria rib rie rig rii rio rir rit riv roa rob roe rog roi roo ror rot rov rra rrb rrg rri rrr rrt rta rtb rte rtg rti rto rtr rtt rtv rva rvb rve rvg rvi rvo rvr rvt rvv taa tab tae tag tai tao tar tat tav tba tbb tbe tbg tbi tbo tbr tbt tbv te- tea teb tee teg tei teo ter tet tev tga tgb tge tgg tgi tgo tgr tgt tgv tia tib tie tig tii tio tir tit tiv to- toa tob toe tog toi too tor tot tov tra trb tre trg tri tro trr trt trv tta ttb tte ttg tti tto ttr ttt ttv tva tvb tve tvg tvi tvo tvr tvt v-a v-e vaa vab vae vag vai vao var vat vav vba vbg vbi vbo vbr vbv vea veb vee veg vei veo ver vet vga vgg vgo vgr vgt vi- via vib vie vig vii vio vir vit viv voa vob voe vog voi voo vor vot vov vra vrb vre vrg vri vrr vrt vta vtb vte vtg vti vto vtr vtt vtv vva vvb vvg vvi vvo vvr vvt vvv