a-a a-b a-c aaa aab aac aan aao aar aaw ab- aba abb abc abn abo abr abw ac- aca acb acc acn aco acr acw an- ana anb anc ann ano anr aoa aob aoc aon aoo aor aow ar- ara arb arc arn aro arr arw aw- awa awb awc awn awo awr aww baa bab bac ban bao bar baw bba bbb bbc bbn bbo bbr bbw bca bcb bcc bcn bco bcr bna bnb bnc bnn bno bnr bnw boa bob boc bon boo bor bow bra brb brn bro brr brw bwa bwb bwc bwo bwr c-- caa cab cac can cao car caw cba cbb cbc cbn cbo cbr cbw cca ccb ccc ccn cco ccr ccw cn- cna cnb cnc cnn cno cnr cnw co- coa cob coc con coo cor cow cra crb crc crn cro crr crw cw- cwa cwb cwc cwn cwo cwr naa nab nac nan nao nar naw nba nbb nbc nbn nbo nbr nbw nca ncb ncc ncn nco ncr ncw nna nnb nnc nnn nno nnw no- noa nob noc non noo nor now nra nrb nrc nrn nro nrr nrw nwa nwb nwc nwn nwo nwr oaa oab oac oan oao oar oaw ob- oba obb obc obn obo obr obw oc- oca ocb occ ocn oco ocr ocw on- ona onb onc onn ono onr oo- ooa oob ooc oon ooo oor oow or- ora orb orc orn oro orr owa owb owc own owo oww ra- raa rab rac ran rao rar raw rba rbb rbc rbn rbo rbr rbw rca rcb rcc rcn rco rcr rcw rna rnb rnc rnn rno rnr rnw roa rob roc ron roo ror row rra rrb rrc rrn rrr rwa rwb rwc rwr waa wab wac wan wao war waw wba wbb wbc wbn wbo wbr wbw wca wcb wcc wcn wco wcr wcw wn- wna wnc wnn wno wnw woa wob woc won woo wor wow wr- wra wrc wrn wro wrr wrw wwa wwc wwn wwo www