ddd dde ddi ddp ddt ddx de- ded dee dei dep det dex di- did die dii dip dit dix dpd dpe dpi dpp dpt dtd dte dti dtp dtt dtx dxd dxi dxp dxt dxx ed- edd ede edi edp edt edx eed eee eep eet eex eid eie eii eip eit eix ep- epd epe epi epp ept epx etd ete eti etp ett etx ex- exd exe exi exp ext exx i-d idd ide idi idp idt idx ie- ied iee iei iep iet iex iid iie iii iip iit iix ipd ipe ipi ipp ipt ipx itd ite iti itp itt itx ixe ixi p-p pdd pde pdi pdp pdt pdx ped pee pei pep pet pex pid pie pii pip pit pix ppd ppe ppi ppp ppt ppx pt- ptd pte pti ptp ptt ptx pxe pxt t-x tdd tde tdi tdp tdt tdx te- ted tee tei tep tet tex tid tie tii tip tit tix tpd tpe tpi tpp tpt tpx ttd tte tti ttp ttt ttx txe txi txt xde xdi xdt xed xee xep xet xex xie xii xit xix xpd xpe xpp xpt xti xtp xtx xxi xxp xxx