ddd dde ddn ddo ddx de- ded dee den deo dex dnd dne dnn dno dod doe don doo dox dxd dxn dxo dxx ed- edd ede edn edo edx eed eee een eeo eex en- end ene enn eno eo- eod eoe eon eoo ex- exd exe exo exx ndd nde ndn ndo ne- ned nee nen neo nex nne nnn nno no- nod noe non noo nox nxd odd ode odn odo oed oee oen oeo oex on- ond one onn ono onx oo- ood oon ooo oox ox- oxn oxo oxx xde xed xee xen xex xno xod xon xoo xox xxo xxx