-er a-a a-b a-i a-t aaa aab aae aaf aai aao aar aat aav ab- aba abb abe abf abi abo abr abt abv aea aeb aee aef aei aeo aer aet aev af- afa afb afe aff afi afo afr aft afv ai- aia aib aie aif aii aio air ait aiv aoa aob aoe aof aoi aoo aor aot aov ar- ara arb are arf ari aro arr art arv at- ata atb ate atf ati ato atr att atv av- ava avb ave avf avi avo avr avt baa bab bae baf bai bao bar bat bav bba bbb bbe bbf bbi bbo bbr bbt be- bea beb bee bef bei beo ber bet bev bfa bfb bfe bff bfi bfo bfr bft bfv bi- bia bib bie bif bii bio bir bit biv boa bob boe bof boi boo bor bot bov bra brb bre brf bri bro brr brt brv bta btb bte btf bti bto btr btt btv bva bvb bve bvi bvo bvr bvt bvv eaa eab eae eaf eai eao ear eat eav eba ebb ebe ebf ebi ebo ebr ebt ebv eea eeb eee eef eeo eer eet eev ef- efa efb efe eff efi efo efr eft eia eib eie eif eii eio eir eit eiv eo- eoa eob eoe eof eoi eoo eor eot era erb ere erf eri ero err ert erv eta etb ete etf eti eto etr ett etv eva evb eve evf evi evo evr evt evv faa fab fae faf fai fao far fat fav fba fbb fbe fbf fbi fbo fbr fbt fea feb fee fef fei feo fer fet fev ffa ffe fff ffi ffo ffr fft ffv fia fib fie fif fii fir fit foa fob foe fof foi foo for fot fra frb fre frf fri fro frr frt fta ftb fte ftf fti fto ftr ftt ftv fva fvt i-f i-v ia- iaa iab iae iaf iai iao iar iat iav iba ibb ibe ibf ibi ibo ibr ibt ibv ie- iea iee ief iei ier iet iev ifa ifb ife iff ifi ifo ifr ift iia iib iie iif iii iio iir iit io- ioa iob ioe iof ioi ioo ior iot iov ir- ira irb ire irf iri iro irr irt irv ita itb ite itf iti ito itt itv iva ivb ive ivf ivi ivo ivr ivt ivv o-i oaa oab oae oaf oai oao oar oat oav ob- oba obb obe obf obi obo obr obt obv oea oeb oee oef oei oeo oer oet of- ofa ofb ofe off ofi ofo ofr oft ofv oia oib oie oif oii oio oir oit oiv oo- ooa oob oof ooi ooo oor oot oov or- ora orb ore orf ori oro orr ort orv ot- ota otb ote otf oti oto otr ott otv ov- ova ovb ove ovf ovi ovo ovv ra- raa rab rae raf rai rao rar rat rav rba rbb rbe rbf rbi rbo rbr rbt re- rea reb ree ref rei reo rer ret rev rfa rfb rfe rff rfi rfo rfr rft rfv ria rib rie rif rii rio rir rit riv roa rob roe rof roi roo ror rot rov rra rrb rrf rri rrr rrt rta rtb rte rtf rti rto rtr rtt rtv rva rvb rve rvf rvi rvo rvr rvt rvv taa tab tae taf tai tao tar tat tav tba tbb tbe tbf tbi tbo tbr tbt tbv te- tea teb tee tef tei teo ter tet tev tfa tfb tfe tff tfi tfo tfr tft tia tib tie tif tii tio tir tit tiv to- toa tob toe tof toi too tor tot tov tra trb tre trf tri tro trr trt trv tta ttb tte ttf tti tto ttr ttt ttv tva tvb tve tvf tvi tvo tvr tvt v-a v-e vaa vab vae vai vao var vat vav vba vbi vbo vbr vbv vea veb vee vef vei veo ver vet vfa vfb vff vfi vfr vft vfv vi- via vib vie vif vii vio vir vit viv voa vob voe vof voi voo vor vot vov vra vrb vre vrf vri vrr vrt vta vtb vte vti vto vtr vtt vtv vva vvb vvi vvo vvr vvt vvv