a-a a-b a-c aaa aab aac aak aao aar aaw aay ab- aba abb abc abk abo abr abw aby ac- aca acb acc ack aco acr acw acy aka akb akc akk ako akr akw aoa aob aoc aok aoo aor aow ar- ara arb arc ark aro arr arw ary aw- awa awb awc awk awo awr aww awy ay- aya ayc ayk ayo ayr ayw baa bab bac bak bao bar baw bay bba bbb bbc bbk bbo bbr bbw bby bca bcb bcc bck bco bcr bcy bka bkb bkc bkk bko bkr bkw boa bob boc bok boo bor bow boy bra brb brk bro brr brw bry bwa bwb bwc bwk bwo bwr bwy by- bya byc byk byo byr c-- caa cab cac cak cao car caw cay cba cbb cbc cbk cbo cbr cbw cby cca ccb ccc cck cco ccr ccw cka ckb ckc cko ckw cky co- coa cob coc cok coo cor cow coy cra crb crc crk cro crr crw cry cw- cwa cwb cwc cwk cwo cwr cya cyb cyc cyk cyo cyr cyw ka- kaa kab kac kak kao kar kaw kay kba kbb kbc kbk kbo kbr kbw kca kcb kcc kck kcr kkb kkc kkk kkr kky koa kob koc kok koo kor kow koy kra krc krk kro krr krw kry kw- kwa kwc kwk kwo kww kya kyc kyo kyr kyw oaa oab oac oak oao oar oaw ob- oba obb obc obk obo obr obw oby oc- oca ocb occ ock oco ocr ocw oka okb okc okk oko okr okw oo- ooa oob ooc ook ooo oor oow or- ora orb orc ork oro orr ory owa owb owc owk owo oww oya oyo ra- raa rab rac rak rao rar raw ray rba rbb rbc rbk rbo rbr rbw rca rcb rcc rco rcr rcw rkb rkc rkk rko rky roa rob roc rok roo ror row roy rra rrb rrc rrk rrr rwa rwb rwc rwr rwy ry- rya ryc ryk ryo ryr ryy waa wab wac wak wao war waw way wba wbb wbc wbo wbr wbw wca wcb wcc wck wco wcr wcw wka wkb wkc wko wkr wkw wky woa wob woc wok woo wor wow woy wr- wra wrc wrk wro wrr wrw wry wwa wwc wwo www wy- wya wyc wyk wyo wyr yaa yab yac yak yao yar yaw yay ybc ybr yby yca ycc yco ycw ycy yka ykk yob yoc yok yoo yor yow yoy yra yrc yro ywc yyb yyc yyy