a-a aaa aad aao aap aas aax ad- ada add ado adp ads adx aoa aod aoo aop aos aox ap- apa apd apo app aps apx as- asa asd aso asp ass asx ax- axa axo axp axs axx daa dad dao dap das dax dda ddd ddo ddp dds ddx doa dod doo dop dos dox dpa dpd dpo dpp dps dsa dsd dso dsp dss dsx dxd dxo dxp dxs dxx oaa oad oao oap oas oax oda odd odo odp ods oo- ooa ood ooo oop oos oox op- opa opd opo opp ops opx os- osa osd oso osp oss osx ox- oxa oxo oxx p-p paa pad pao pap pas pax pda pdd pdo pdp pds pdx poa pod poo pop pos pox ppa ppd ppo ppp pps ppx ps- psa psd pso psp pss psx pxs saa sad sao sap sas sax sda sdd sdo sdp sds soa sod soo sop sos sox spa spd spo spp sps spx ss- ssa ssd sso ssp sss ssx sxs xaa xad xap xas xda xds xoa xod xoo xop xos xox xpa xpd xpo xpp xps xsa xsp xss xxo xxp xxx