a-a a-c aaa aac aao aas aaw ac- aca acc aco acs acw aoa aoc aoo aos aow as- asa asc aso ass asw aw- awa awc awo aws aww c-- caa cac cao cas caw cca ccc cco ccs ccw co- coa coc coo cos cow csa csc cso css csw cw- cwa cwc cwo cws oaa oac oao oas oaw oc- oca occ oco ocs ocw oo- ooa ooc ooo oos oow os- osa osc oso oss osw owa owc owo ows oww saa sac sao sas saw sca scc sco scs scw soa soc soo sos sow ss- ssa ssc sso sss ssw swa swc swo sws waa wac wao was waw wca wcc wco wcs wcw woa woc woo wos wow wsa wsc wso wss wsw wwa wwc wwo www