This is from page 622 of O’Brien and Bosc. I read it this morning, but here we go again:
Repetition is prohibited in order to safeguard the right of the House to arrive at a decision and to make efficient use of its time. Although the principle is clear and sensible, it has not always been easy to apply and the Speaker enjoys considerable discretion—
—and I emphasize those words this morning, that indeed the chair has considerable discretion——in this regard.
I'm moving on to Ms. Freeman.