a-a a-b aaa aab aad aak aao aaw ab- aba abb abd abk abo abw ad- ada adb add adk ado adw aka akb akd akk ako akw aoa aob aod aok aoo aow aw- awa awb awd awk awo aww baa bab bad bak bao baw bba bbb bbd bbk bbo bbw bda bdb bdd bdk bdo bdw bka bkb bkk bko bkw boa bob bod bok boo bow bwa bwb bwd bwk bwo daa dab dad dak dao daw dba dbb dbd dbk dbo dda ddb ddd ddk ddo ddw dka dkb dkk dko dkw doa dob dod dok doo dow dwa dwb dwo dww ka- kaa kab kad kak kao kaw kba kbb kbd kbk kbo kbw kda kdb kdk kdo kkb kkk koa kob kod kok koo kow kw- kwa kwd kwk kwo kww oaa oab oad oak oao oaw ob- oba obb obd obk obo obw oda odb odd odo oka okb okd okk oko okw oo- ooa oob ood ook ooo oow owa owb owd owk owo oww waa wab wad wak wao waw wba wbb wbd wbo wbw wda wdb wka wkb wkd wko wkw woa wob wod wok woo wow wwa wwd wwo www