a-a a-i aaa aad aai aas aax ad- ada add adi ads adx ai- aia aid aii ais aix as- asa asd asi ass asx ax- axa axi axs axx daa dad dai das dax dda ddd ddi dds ddx di- dia did dii dis dix dsa dsd dsi dss dsx dxd dxi dxs dxx i-d ia- iaa iad iai ias ida idd idi ids idx iia iid iii iis iix is- isa isd isi iss ixi saa sad sai sas sax sda sdd sdi sds sia sid sii sis six ss- ssa ssd ssi sss ssx sxi sxs xaa xad xas xda xdi xds xia xii xis xix xsa xsi xss xxi xxx