a-a a-b a-z aaa aab aad aao aar aaw aaz ab- aba abb abd abo abr abw abz ad- ada adb add ado adr adw adz aoa aob aod aoo aor aow ar- ara arb ard aro arr arw arz aw- awa awb awd awo awr aww az- aza azb azd azo azw azz baa bab bad bao bar baw baz bba bbb bbd bbo bbr bbw bda bdb bdd bdo bdr bdw bdz boa bob bod boo bor bow boz bra brb brd bro brr brw brz bwa bwb bwd bwo bwr bza bzd bzo bzr bzz daa dab dad dao dar daw daz dba dbb dbd dbo dbr dbz dda ddb ddd ddo ddr ddw ddz doa dob dod doo dor dow doz dra drb drd dro drr drw drz dwa dwb dwo dwr dww dza dzb dzd dzo dzr oaa oab oad oao oar oaw ob- oba obb obd obo obr obw oda odb odd odo odr oo- ooa oob ood ooo oor oow or- ora orb ord oro orr orz owa owb owd owo oww oza ozo ozw ozz ra- raa rab rad rao rar raw raz rba rbb rbd rbo rbr rbw rda rdb rdd rdo rdr roa rob rod roo ror row roz rra rrb rrd rrr rwa rwb rwd rwr rza rzb rzo waa wab wad wao war waw waz wba wbb wbd wbo wbr wbw wbz wda wdb wdr wdz woa wob wod woo wor wow woz wr- wra wrd wro wrr wrw wwa wwd wwo www zaa zab zad zao zar zaz zbb zbr zbw zo- zoa zob zod zoo zor zow zro zzr zzz