a-a a-b a-i aaa aab aad aag aai aao aar ab- aba abb abd abg abi abo abr ad- ada adb add adg adi ado adr ag- aga agb agd agg agi ago agr ai- aia aib aid aig aii aio air aoa aob aod aog aoi aoo aor ar- ara arb ard arg ari aro arr baa bab bad bag bai bao bar bba bbb bbd bbg bbi bbo bbr bda bdb bdd bdg bdi bdo bdr bga bgb bgd bgg bgi bgo bgr bi- bia bib bid big bii bio bir boa bob bod bog boi boo bor bra brb brd brg bri bro brr daa dab dad dag dai dao dar dba dbb dbd dbg dbi dbo dbr dda ddb ddd ddg ddi ddo ddr dga dgd dgg dgi dgr di- dia dib did dig dii dio dir doa dob dod dog doi doo dor dra drb drd drg dri dro drr g-d gaa gab gad gag gai gao gar gba gbd gbg gbi gbo gbr gda gdb gdd gdi gdo gdr gga ggb ggd ggg ggi ggo ggr gia gib gid gig gii gio gir goa gob god gog goi goo gor gra grb grd grg gri gro grr i-d ia- iaa iab iad iag iai iao iar iba ibb ibd ibg ibi ibo ibr ida idb idd idg idi ido idr iga igb igd igg igi igo igr iia iib iid iii iio iir io- ioa iob iod iog ioi ioo ior ir- ira irb ird irg iri iro irr o-i oaa oab oad oag oai oao oar ob- oba obb obd obg obi obo obr oda odb odd odg odi odo odr oga ogd ogg ogi ogo oia oib oid oii oio oir oo- ooa oob ood oog ooi ooo oor or- ora orb ord org ori oro orr ra- raa rab rad rag rai rao rar rba rbb rbd rbg rbi rbo rbr rda rdb rdd rdg rdi rdo rdr rga rgb rgd rgg rgi rgo rgr ria rib rid rig rii rio rir roa rob rod rog roi roo ror rra rrb rrd rrg rri rrr