Cover bowl with plastic wrap, then towel. Lightly oil heavy large baking sheet. Punch down dough. Turn dough out onto floured surface. Braid ropes together.
Tuck ends under and pinch together.
Transfer braid to prepared baking sheet. Braid ropes together. Tuck ends under and pinch together. Brush large braid with some of egg glaze. Place small braid atop center of large braid.