a-a a-c aaa aac aah aas aax ac- aca acc ach acs acx aha ahc ahh ahs ahx as- asa asc ash ass asx ax- axa axh axs axx c-- caa cac cah cas cax cca ccc cch ccs ccx ch- cha chc chh chs chx csa csc csh css csx cxc cxh cxs cxx haa hac hah has hax hca hcc hch hcs hha hhc hhh hhs hsa hsc hsh hss hsx hxc saa sac sah sas sax sca scc sch scs scx sh- sha shc shh shs ss- ssa ssc ssh sss ssx sxc sxs xaa xac xas xch xcx xsa xsc xss xxx