From what I've heard this morning—and this is my first exposure to this discussion—am I correct in assuming that your vision of where the fuel alternatives are going to take you is still that it is going to be a fairly broad selection of combinations for the next number of years?
You mentioned 25 years, Mr. Stoddart or Mr. Allen, with regard to that timeline, before we have enough efficiency of one fuel or another that we're going to narrow that funnel down, but it sounds to me as if this is going to be a combination of fuels that is going to last quite a long while yet—whether it's diesel, electric, CNG, or battery operated.