a-a a-b a-c aaa aab aac aan aao aas aaw ab- aba abb abc abn abo abs abw ac- aca acb acc acn aco acs acw an- ana anb anc ann ano ans aoa aob aoc aon aoo aos aow as- asa asb asc asn aso ass asw aw- awa awb awc awn awo aws aww baa bab bac ban bao bas baw bba bbb bbc bbn bbo bbs bbw bca bcb bcc bcn bco bcs bna bnb bnc bnn bno bns bnw boa bob boc bon boo bos bow bsa bsb bsc bsn bso bss bsw bwa bwb bwc bwo bws c-- caa cab cac can cao cas caw cba cbb cbc cbn cbo cbs cbw cca ccb ccc ccn cco ccs ccw cn- cna cnb cnc cnn cno cns cnw co- coa cob coc con coo cos cow csa csb csc csn cso css csw cw- cwa cwb cwc cwn cwo cws naa nab nac nan nao nas naw nba nbb nbc nbn nbo nbs nbw nca ncb ncc ncn nco ncs ncw nna nnb nnc nnn nno nns nnw no- noa nob noc non noo nos now nsa nsb nsc nsn nso nss nsw nwa nwb nwc nwn nwo nws oaa oab oac oan oao oas oaw ob- oba obb obc obn obo obs obw oc- oca ocb occ ocn oco ocs ocw on- ona onb onc onn ono ons oo- ooa oob ooc oon ooo oos oow os- osa osb osc osn oso oss osw owa owb owc own owo ows oww saa sab sac san sao sas saw sba sbb sbc sbn sbo sbs sbw sca scb scc scn sco scs scw sna snb snc snn sno sns snw soa sob soc son soo sos sow ss- ssa ssb ssc ssn sso sss ssw swa swb swc swn swo sws waa wab wac wan wao was waw wba wbb wbc wbn wbo wbs wbw wca wcb wcc wcn wco wcs wcw wn- wna wnc wnn wno wns wnw woa wob woc won woo wos wow wsa wsb wsc wsn wso wss wsw wwa wwc wwn wwo www