a-a a-b a-i aaa aab aad aaf aai aam aao aar ab- aba abb abd abf abi abm abo abr ad- ada adb add adf adi adm ado adr af- afa afb afd aff afi afm afo afr ai- aia aib aid aif aii aim aio air ama amb amd amf ami amm amo amr aoa aob aod aof aoi aom aoo aor ar- ara arb ard arf ari arm aro arr baa bab bad baf bai bam bao bar bba bbb bbd bbf bbi bbm bbo bbr bda bdb bdd bdf bdi bdm bdo bdr bfa bfb bfd bff bfi bfm bfo bfr bi- bia bib bid bif bii bim bio bir bma bmb bmd bmf bmi bmm bmo bmr boa bob bod bof boi bom boo bor bra brb brd brf bri brm bro brr daa dab dad daf dai dam dao dar dba dbb dbd dbf dbi dbm dbo dbr dda ddb ddd ddf ddi ddm ddo ddr dfa dfb dfd dff dfi dfm dfo dfr di- dia dib did dif dii dim dio dir dma dmb dmd dmf dmi dmm dmo dmr doa dob dod dof doi dom doo dor dra drb drd dri drm dro drr faa fab fad faf fai fam fao far fba fbb fbd fbf fbi fbm fbo fbr fda fdb fdd fdf fdi fdm fdo fdr ffa ffd fff ffi ffm ffo ffr fia fib fid fif fii fim fir fma fmb fmd fmf fmi fmm fmo fmr foa fob fof foi fom foo for fra frb frd frf fri frm fro frr i-d i-f ia- iaa iab iad iaf iai iam iao iar iba ibb ibd ibf ibi ibm ibo ibr ida idb idd idf idi idm ido idr ifa ifb ifd iff ifi ifm ifo ifr iia iib iid iif iii iim iio iir im- ima imb imd imf imi imm imo io- ioa iob iod iof ioi iom ioo ior ir- ira irb ird irf iri irm iro irr m-f m-o m-r maa mab mad maf mai mam mao mar mba mbb mbd mbf mbi mbm mbo mbr mda mdb mdd mdf mdi mdm mdo mdr mfa mfb mfd mff mfi mfm mfo mfr mi- mia mib mid mif mii mim mio mir mma mmb mmd mmf mmi mmm mmo mmr moa mob mod mof moi mom moo mor mra mrb mrd mrf mri mrm mro mrr o-i oaa oab oad oaf oai oam oao oar ob- oba obb obd obf obi obm obo obr oda odb odd odf odi odm odo odr of- ofa ofb ofd off ofi ofm ofo ofr oia oib oid oif oii oim oio oir om- oma omb omd omf omi omm omo omr oo- ooa oob ood oof ooi oom ooo oor or- ora orb ord orf ori orm oro orr ra- raa rab rad raf rai ram rao rar rba rbb rbd rbf rbi rbm rbo rbr rda rdb rdd rdf rdi rdm rdo rdr rfa rfb rfd rff rfi rfm rfo rfr ria rib rid rif rii rim rio rir rma rmb rmd rmf rmi rmm rmo rmr roa rob rod rof roi rom roo ror rra rrb rrd rrf rri rrm rrr