a-a a-c aaa aac aap aaw aax ac- aca acc acp acw acx ap- apa apc app apw apx aw- awa awc awp aww ax- axa axp axx c-- caa cac cap caw cax cca ccc ccp ccw ccx cpa cpc cpp cpw cpx cw- cwa cwc cwp cxc cxp cxx p-p paa pac pap paw pax pca pcc pcp pcw pcx ppa ppc ppp ppw ppx pwa pwc pwp pxc waa wac wap waw wax wca wcc wcp wcw wcx wpa wpc wpp wpx wwa wwc wwp www wxc wxp wxw xaa xac xap xcp xcx xpa xpc xpp xpw xwa xwp xxp xxx