a-a a-b a-i a-t aaa aab aad aag aai aao aar aat ab- aba abb abd abg abi abo abr abt ad- ada adb add adg adi ado adr adt ag- aga agb agd agg agi ago agr agt ai- aia aib aid aig aii aio air ait aoa aob aod aog aoi aoo aor aot ar- ara arb ard arg ari aro arr art at- ata atb atd atg ati ato atr att baa bab bad bag bai bao bar bat bba bbb bbd bbg bbi bbo bbr bbt bda bdb bdd bdg bdi bdo bdr bdt bga bgb bgd bgg bgi bgo bgr bgt bi- bia bib bid big bii bio bir bit boa bob bod bog boi boo bor bot bra brb brd brg bri bro brr brt bta btb btd btg bti bto btr btt daa dab dad dag dai dao dar dat dba dbb dbd dbg dbi dbo dbr dbt dda ddb ddd ddg ddi ddo ddr ddt dga dgd dgg dgi dgr dgt di- dia dib did dig dii dio dir dit doa dob dod dog doi doo dor dot dra drb drd drg dri dro drr drt dta dtb dtd dtg dti dto dtr dtt g-d gaa gab gad gag gai gao gar gat gba gbd gbg gbi gbo gbr gbt gda gdb gdd gdi gdo gdr gdt gga ggb ggd ggg ggi ggo ggr ggt gia gib gid gig gii gio gir git goa gob god gog goi goo gor got gra grb grd grg gri gro grr grt gta gtb gtd gtg gti gto gtr gtt i-d ia- iaa iab iad iag iai iao iar iat iba ibb ibd ibg ibi ibo ibr ibt ida idb idd idg idi ido idr idt iga igb igd igg igi igo igr igt iia iib iid iii iio iir iit io- ioa iob iod iog ioi ioo ior iot ir- ira irb ird irg iri iro irr irt ita itb itd itg iti ito itt o-i oaa oab oad oag oai oao oar oat ob- oba obb obd obg obi obo obr obt oda odb odd odg odi odo odr odt oga ogd ogg ogi ogo ogt oia oib oid oii oio oir oit oo- ooa oob ood oog ooi ooo oor oot or- ora orb ord org ori oro orr ort ot- ota otb otd otg oti oto otr ott ra- raa rab rad rag rai rao rar rat rba rbb rbd rbg rbi rbo rbr rbt rda rdb rdd rdg rdi rdo rdr rdt rga rgb rgd rgg rgi rgo rgr rgt ria rib rid rig rii rio rir rit roa rob rod rog roi roo ror rot rra rrb rrd rrg rri rrr rrt rta rtb rtd rtg rti rto rtr rtt taa tab tad tag tai tao tar tat tba tbb tbd tbg tbi tbo tbr tbt tda tdb tdd tdg tdi tdo tdr tdt tga tgb tgg tgi tgo tgr tgt tia tib tid tig tii tio tir tit to- toa tob tod tog toi too tor tot tra trb trd trg tri tro trr trt tta ttb ttd ttg tti tto ttr ttt