Is there any logic to the rotation of food items in the MLLs? Examples:

• On the 8th, YYC and YVR both had bacon as the breakfast meat. On the 19th, both had nondescript "sausages" - are they beef? Pork? Chicken? Turkey? Who knows! - but on the 20th and today, YYC has chorizo (which is pretty good)
• Same dates, YVR always had roasted potatoes. YYC had some kind of diced/roasted potatoes on the 8th, then "Potatoes O'Brien" (same roasted potatoes with peppers and maybe onions?) on the 19th and 20th, but today hash brown patties (which are the best)
• YWG MLL had exactly the same midday food offerings every time except yesterday, when the soups changed over, and I think there was something else different. Although they still put out the "tomato ravioli soup" sign for what was clearly now minestrone

They don't seem to have all changed things on the same day, and things don't seem to rotate based on day of the week. Is it as simple as they use something up and switch whenever they run out?

Sliders at YYC are still by far the best food in the MLL network.