a-a a-b a-i aaa aab aad aag aai aar ab- aba abb abd abg abi abr ad- ada adb add adg adi adr ag- aga agb agd agg agi agr ai- aia aib aid aig aii air ar- ara arb ard arg ari arr baa bab bad bag bai bar bba bbb bbd bbg bbi bbr bda bdb bdd bdg bdi bdr bga bgb bgd bgg bgi bgr bi- bia bib bid big bii bir bra brb brd brg bri brr daa dab dad dag dai dar dba dbb dbd dbg dbi dbr dda ddb ddd ddg ddi ddr dga dgd dgg dgi dgr di- dia dib did dig dii dir dra drb drd drg dri drr g-d gaa gab gad gag gai gar gba gbd gbg gbi gbr gda gdb gdd gdi gdr gga ggb ggd ggg ggi ggr gia gib gid gig gii gir gra grb grd grg gri grr i-d ia- iaa iab iad iag iai iar iba ibb ibd ibg ibi ibr ida idb idd idg idi idr iga igb igd igg igi igr iia iib iid iii iir ir- ira irb ird irg iri irr ra- raa rab rad rag rai rar rba rbb rbd rbg rbi rbr rda rdb rdd rdg rdi rdr rga rgb rgd rgg rgi rgr ria rib rid rig rii rir rra rrb rrd rrg rri rrr