-er a-a a-b a-i a-t aaa aab aae aai aao aar aat aau aav ab- aba abb abe abi abo abr abt abu abv aea aeb aee aei aeo aer aet aeu aev ai- aia aib aie aii aio air ait aiu aiv aoa aob aoe aoi aoo aor aot aou aov ar- ara arb are ari aro arr art aru arv at- ata atb ate ati ato atr att atu atv au- aua aub aue aui auo aur aut auv av- ava avb ave avi avo avr avt avu b-u baa bab bae bai bao bar bat bau bav bba bbb bbe bbi bbo bbr bbt bbu be- bea beb bee bei beo ber bet beu bev bi- bia bib bie bii bio bir bit biu biv boa bob boe boi boo bor bot bou bov bra brb bre bri bro brr brt bru brv bta btb bte bti bto btr btt btu btv bua bub bue bui buo bur but buu bva bvb bve bvi bvo bvr bvt bvu bvv eaa eab eae eai eao ear eat eau eav eba ebb ebe ebi ebo ebr ebt ebu ebv eea eeb eee eeo eer eet eev eia eib eie eii eio eir eit eiu eiv eo- eoa eob eoe eoi eoo eor eot eou era erb ere eri ero err ert eru erv eta etb ete eti eto etr ett etu etv eu- eua eub eue eui eur eut euv eva evb eve evi evo evr evt evv i-v ia- iaa iab iae iai iao iar iat iau iav iba ibb ibe ibi ibo ibr ibt ibu ibv ie- iea iee iei ier iet iev iia iib iie iii iio iir iit iiu io- ioa iob ioe ioi ioo ior iot iou iov ir- ira irb ire iri iro irr irt iru irv ita itb ite iti ito itt itu itv iu- iua iub iue iui iur iut iva ivb ive ivi ivo ivr ivt ivu ivv o-i oaa oab oae oai oao oar oat oau oav ob- oba obb obe obi obo obr obt obu obv oea oeb oee oei oeo oer oet oia oib oie oii oio oir oit oiu oiv oo- ooa oob ooi ooo oor oot oov or- ora orb ore ori oro orr ort oru orv ot- ota otb ote oti oto otr ott otu otv ou- oua oue oui ouo our out ov- ova ovb ove ovi ovo ovv ra- raa rab rae rai rao rar rat rau rav rba rbb rbe rbi rbo rbr rbt rbu re- rea reb ree rei reo rer ret reu rev ria rib rie rii rio rir rit riv roa rob roe roi roo ror rot rou rov rra rrb rri rrr rrt rru rta rtb rte rti rto rtr rtt rtu rtv rua rub rue rui ruo rur rut ruu ruv rva rvb rve rvi rvo rvr rvt rvu rvv taa tab tae tai tao tar tat tau tav tba tbb tbe tbi tbo tbr tbt tbu tbv te- tea teb tee tei teo ter tet teu tev tia tib tie tii tio tir tit tiu tiv to- toa tob toe toi too tor tot tou tov tra trb tre tri tro trr trt tru trv tta ttb tte tti tto ttr ttt ttu ttv tua tub tue tui tuo tur tut tuu tuv tva tvb tve tvi tvo tvr tvt tvu ua- uaa uab uae uai uao uar uat uau uav uba ubb ube ubi ubo ubr ubt ubu ubv uea ueb uee uei uer uet uia uib uie uii uio uir uit uiu uoa uob uoe uoo uor uot ur- ura urb ure uri uro urr urt uru uta utb ute uti uto utr utt utu utv uua uue uur uut uuu uva uvb uve uvo uvu uvv v-a v-e vaa vab vae vai vao var vat vau vav vba vbi vbo vbr vbv vea veb vee vei veo ver vet veu vi- via vib vie vii vio vir vit viu viv voa vob voe voi voo vor vot vou vov vra vrb vre vri vrr vrt vru vta vtb vte vti vto vtr vtt vtu vtv vue vur vut vuv vva vvb vvi vvo vvr vvt vvv