The EO combination is basic connection, the O can be place inside the E, but the E's center bar cannot pas through the O or it will look like a double E, this makes it difficult to draw, it is usually best to use the basic connection form.
I actually do not require strict attribution as the licence indicates. I realize the "puzzle" value would be lost I will galdly provide express exemptions for your projects Please contact me at vasten@dscript.org