a-a a-b aaa aab aad aae aaf aag aao aau ab- aba abb abd abe abf abg abo abu ad- ada adb add ade adf adg ado adu aea aeb aed aee aef aeg aeo aeu af- afa afb afd afe aff afg afo afu ag- aga agb agd age agf agg ago agu aoa aob aod aoe aof aog aoo aou au- aua aub aud aue auf aug auo b-u baa bab bad bae baf bag bao bau bba bbb bbd bbe bbf bbg bbo bbu bda bdb bdd bde bdf bdg bdo bdu be- bea beb bed bee bef beg beo beu bfa bfb bfd bfe bff bfg bfo bfu bga bgb bgd bge bgf bgg bgo bgu boa bob bod boe bof bog boo bou bua bub bud bue buf bug buo buu daa dab dad dae daf dag dao dau dba dbb dbd dbe dbf dbg dbo dbu dda ddb ddd dde ddf ddg ddo ddu de- dea deb ded dee def deg deo deu dfa dfb dfd dfe dff dfg dfo dfu dga dgd dge dgf dgg dgu doa dob dod doe dof dog doo dou dua dub dud due duf dug duo eaa eab ead eae eaf eag eao eau eba ebb ebd ebe ebf ebg ebo ebu ed- eda edb edd ede edf edg edo edu eea eeb eed eee eef eeg eeo ef- efa efb efd efe eff efg efo ega egb egd ege egf egg ego egu eo- eoa eob eod eoe eof eog eoo eou eu- eua eub eud eue euf eug faa fab fad fae faf fag fao fau fba fbb fbd fbe fbf fbg fbo fbu fda fdb fdd fde fdf fdg fdo fdu fea feb fed fee fef feg feo feu ffa ffd ffe fff ffg ffo ffu fga fgb fgd fge fgf fgg foa fob foe fof fog foo fou fua fub fud fue fuf fug fuo fuu g-d gaa gab gad gae gaf gag gao gau gba gbd gbe gbf gbg gbo gbu gda gdb gdd gde gdf gdo gdu ge- gea geb ged gee gef geg geo geu gfa gfb gfd gfe gff gfo gga ggb ggd ggg ggo ggu goa gob god goe gof gog goo gou gu- gua gub gud gue guf gug guo guu oaa oab oad oae oaf oag oao oau ob- oba obb obd obe obf obg obo obu oda odb odd ode odf odg odo odu oea oeb oed oee oef oeg oeo of- ofa ofb ofd ofe off ofg ofo ofu oga ogd oge ogf ogg ogo oo- ooa oob ood oof oog ooo ou- oua oud oue ouf ouo ua- uaa uab uad uae uaf uag uao uau uba ubb ube ubf ubg ubo ubu uda udb udd ude udf udg udo udu uea ueb ued uee uef ueg ufa ufd ufe uff ufg ufo ufu uga ugb uge ugf ugg ugo ugu uoa uob uod uoe uog uoo uua uue uug uuu