Thank you very much, Mr. Chair.
Mr. Boag, I wanted to pick up on one of the things you commented on, the seasonality factor. It was brought out first in Mr. Corey's presentation when he dealt with fuel specifications and seasonality, and you've spoken about it as well.
When you look at the seasonality factors in Canada and potentially the number of different products that we would have in Canada based on that factor, first of all, how does seasonality change the refinery setup and configuration, or does it? Second, how many fuel specs do we have, and how often do they actually change?