a-a a-b a-c aaa aab aac aak aan aao aar aaw ab- aba abb abc abk abn abo abr abw ac- aca acb acc ack acn aco acr acw aka akb akc akk akn ako akr akw an- ana anb anc ank ann ano anr aoa aob aoc aok aon aoo aor aow ar- ara arb arc ark arn aro arr arw aw- awa awb awc awk awn awo awr aww baa bab bac bak ban bao bar baw bba bbb bbc bbk bbn bbo bbr bbw bca bcb bcc bck bcn bco bcr bka bkb bkc bkk bkn bko bkr bkw bna bnb bnc bnk bnn bno bnr bnw boa bob boc bok bon boo bor bow bra brb brk brn bro brr brw bwa bwb bwc bwk bwo bwr c-- caa cab cac cak can cao car caw cba cbb cbc cbk cbn cbo cbr cbw cca ccb ccc cck ccn cco ccr ccw cka ckb ckc cko ckw cn- cna cnb cnc cnn cno cnr cnw co- coa cob coc cok con coo cor cow cra crb crc crk crn cro crr crw cw- cwa cwb cwc cwk cwn cwo cwr ka- kaa kab kac kak kan kao kar kaw kba kbb kbc kbk kbn kbo kbr kbw kca kcb kcc kck kcn kcr kkb kkc kkk kkn kkr kn- kna knc knk knn kno knr koa kob koc kok kon koo kor kow kra krc krk krn kro krr krw kw- kwa kwc kwk kwo kww naa nab nac nak nan nao nar naw nba nbb nbc nbk nbn nbo nbr nbw nca ncb ncc nck ncn nco ncr ncw nka nkc nkk nkn nko nkr nna nnb nnc nnk nnn nno nnw no- noa nob noc nok non noo nor now nra nrb nrc nrk nrn nro nrr nrw nwa nwb nwc nwn nwo nwr oaa oab oac oak oan oao oar oaw ob- oba obb obc obk obn obo obr obw oc- oca ocb occ ock ocn oco ocr ocw oka okb okc okk oko okr okw on- ona onb onc onk onn ono onr oo- ooa oob ooc ook oon ooo oor oow or- ora orb orc ork orn oro orr owa owb owc owk own owo oww ra- raa rab rac rak ran rao rar raw rba rbb rbc rbk rbn rbo rbr rbw rca rcb rcc rcn rco rcr rcw rkb rkc rkk rko rna rnb rnc rnn rno rnr rnw roa rob roc rok ron roo ror row rra rrb rrc rrk rrn rrr rwa rwb rwc rwr waa wab wac wak wan wao war waw wba wbb wbc wbn wbo wbr wbw wca wcb wcc wck wcn wco wcr wcw wka wkb wkc wko wkr wkw wn- wna wnc wnn wno wnw woa wob woc wok won woo wor wow wr- wra wrc wrk wrn wro wrr wrw wwa wwc wwn wwo www