a-a a-i aaa aad aai aap aas aax ad- ada add adi adp ads adx ai- aia aid aii aip ais aix ap- apa apd api app aps apx as- asa asd asi asp ass asx ax- axa axi axp axs axx daa dad dai dap das dax dda ddd ddi ddp dds ddx di- dia did dii dip dis dix dpa dpd dpi dpp dps dsa dsd dsi dsp dss dsx dxd dxi dxp dxs dxx i-d ia- iaa iad iai iap ias ida idd idi idp ids idx iia iid iii iip iis iix ipa ipd ipi ipp ips ipx is- isa isd isi isp iss ixi p-p paa pad pai pap pas pax pda pdd pdi pdp pds pdx pia pid pii pip pis pix ppa ppd ppi ppp pps ppx ps- psa psd psi psp pss psx pxs saa sad sai sap sas sax sda sdd sdi sdp sds sia sid sii sip sis six spa spd spi spp sps spx ss- ssa ssd ssi ssp sss ssx sxi sxs xaa xad xap xas xda xdi xds xia xii xis xix xpa xpd xpp xps xsa xsi xsp xss xxi xxp xxx