First of all, a circle has no edges. But if you want to call the curvy line an edge, then it has at most only one. But we know what you mean ... a line segment through a circle, from one point on the...
6 of one, half a dozen of another
Six of one and half a dozen of another.
the answer is one another.
maybe when you itch your head your pushing them back and forth so you are pushing another egg out