ddd dde ddf ddo ddp ddt ddx de- ded dee def deo dep det dex dfd dfe dff dfo dfp dft dfx dod doe dof doo dop dot dox dpd dpe dpf dpo dpp dpt dtd dte dtf dto dtp dtt dtx dxd dxo dxp dxt dxx ed- edd ede edf edo edp edt edx eed eee eef eeo eep eet eex ef- efd efe eff efo efp eft efx eo- eod eoe eof eoo eop eot ep- epd epe epf epo epp ept epx etd ete etf eto etp ett etx ex- exd exe exo exp ext exx fdd fde fdf fdo fdp fdt fdx fed fee fef feo fep fet fex ffd ffe fff ffo ffp fft ffx foe fof foo fop fot fox fpd fpe fpo fpp fpt fpx ftd fte ftf fto ftp ftt ftx fxe fxp fxt fxx odd ode odf odo odp odt oed oee oef oeo oep oet oex of- ofd ofe off ofo ofp oft ofx oo- ood oof ooo oop oot oox op- opd ope opf opo opp opt opx ot- otd ote otf oto otp ott ox- oxf oxo oxt oxx p-p pdd pde pdf pdo pdp pdt pdx ped pee pef peo pep pet pex pfd pfe pff pfo pfp pft pfx pod poe pof poo pop pot pox ppd ppe ppf ppo ppp ppt ppx pt- ptd pte ptf pto ptp ptt ptx pxe pxt t-x tdd tde tdf tdo tdp tdt tdx te- ted tee tef teo tep tet tex tfd tfe tff tfo tfp tft tfx to- tod toe tof too top tot tox tpd tpe tpf tpo tpp tpt tpx ttd tte ttf tto ttp ttt ttx txe txf txt xde xdf xdt xed xee xep xet xex xfe xft xfx xod xof xoo xop xot xox xpd xpe xpf xpo xpp xpt xtf xtp xtx xxo xxp xxx