a-a a-b a-i a-t aaa aab aaf aai aao aar aat aav ab- aba abb abf abi abo abr abt abv af- afa afb aff afi afo afr aft afv ai- aia aib aif aii aio air ait aiv aoa aob aof aoi aoo aor aot aov ar- ara arb arf ari aro arr art arv at- ata atb atf ati ato atr att atv av- ava avb avf avi avo avr avt baa bab baf bai bao bar bat bav bba bbb bbf bbi bbo bbr bbt bfa bfb bff bfi bfo bfr bft bfv bi- bia bib bif bii bio bir bit biv boa bob bof boi boo bor bot bov bra brb brf bri bro brr brt brv bta btb btf bti bto btr btt btv bva bvb bvi bvo bvr bvt bvv faa fab faf fai fao far fat fav fba fbb fbf fbi fbo fbr fbt ffa fff ffi ffo ffr fft ffv fia fib fif fii fir fit foa fob fof foi foo for fot fra frb frf fri fro frr frt fta ftb ftf fti fto ftr ftt ftv fva fvt i-f i-v ia- iaa iab iaf iai iao iar iat iav iba ibb ibf ibi ibo ibr ibt ibv ifa ifb iff ifi ifo ifr ift iia iib iif iii iio iir iit io- ioa iob iof ioi ioo ior iot iov ir- ira irb irf iri iro irr irt irv ita itb itf iti ito itt itv iva ivb ivf ivi ivo ivr ivt ivv o-i oaa oab oaf oai oao oar oat oav ob- oba obb obf obi obo obr obt obv of- ofa ofb off ofi ofo ofr oft ofv oia oib oif oii oio oir oit oiv oo- ooa oob oof ooi ooo oor oot oov or- ora orb orf ori oro orr ort orv ot- ota otb otf oti oto otr ott otv ov- ova ovb ovf ovi ovo ovv ra- raa rab raf rai rao rar rat rav rba rbb rbf rbi rbo rbr rbt rfa rfb rff rfi rfo rfr rft rfv ria rib rif rii rio rir rit riv roa rob rof roi roo ror rot rov rra rrb rrf rri rrr rrt rta rtb rtf rti rto rtr rtt rtv rva rvb rvf rvi rvo rvr rvt rvv taa tab taf tai tao tar tat tav tba tbb tbf tbi tbo tbr tbt tbv tfa tfb tff tfi tfo tfr tft tia tib tif tii tio tir tit tiv to- toa tob tof toi too tor tot tov tra trb trf tri tro trr trt trv tta ttb ttf tti tto ttr ttt ttv tva tvb tvf tvi tvo tvr tvt v-a vaa vab vai vao var vat vav vba vbi vbo vbr vbv vfa vfb vff vfi vfr vft vfv vi- via vib vif vii vio vir vit viv voa vob vof voi voo vor vot vov vra vrb vrf vri vrr vrt vta vtb vti vto vtr vtt vtv vva vvb vvi vvo vvr vvt vvv