a-a a-b a-t aaa aab aak aao aar aat aaw ab- aba abb abk abo abr abt abw aka akb akk ako akr akw aoa aob aok aoo aor aot aow ar- ara arb ark aro arr art arw at- ata atb ato atr att atw aw- awa awb awk awo awr awt aww baa bab bak bao bar bat baw bba bbb bbk bbo bbr bbt bbw bka bkb bkk bko bkr bkt bkw boa bob bok boo bor bot bow bra brb brk bro brr brt brw bta btb btk bto btr btt btw bwa bwb bwk bwo bwr k-t ka- kaa kab kak kao kar kat kaw kba kbb kbk kbo kbr kbw kkb kkk kkr kkt koa kob kok koo kor kot kow kra krk kro krr krt krw kta ktb ktk kto ktr ktt ktw kw- kwa kwk kwo kwt kww oaa oab oak oao oar oat oaw ob- oba obb obk obo obr obt obw oka okb okk oko okr okw oo- ooa oob ook ooo oor oot oow or- ora orb ork oro orr ort ot- ota otb otk oto otr ott otw owa owb owk owo owt oww ra- raa rab rak rao rar rat raw rba rbb rbk rbo rbr rbt rbw rkb rkk rko rkt roa rob rok roo ror rot row rra rrb rrk rrr rrt rta rtb rtk rto rtr rtt rtw rwa rwb rwr taa tab tak tao tar tat taw tba tbb tbk tbo tbr tbt tka tkb tkk tko tkr tkt tkw to- toa tob tok too tor tot tow tra trb trk tro trr trt trw tta ttb ttk tto ttr ttt ttw twa twb two twr twt tww waa wab wak wao war wat waw wba wbb wbo wbr wbt wbw wka wkb wko wkr wkt wkw woa wob wok woo wor wot wow wr- wra wrk wro wrr wrt wrw wta wtb wto wtr wtt wtw wwa wwo wwt www