I need only one grease. The one I'll use for my car and my boat and my trailer, and my mower, and my porch swing, and my loppers, and my weed eater, and my floor jack, and my bicycles...
Marine Grease Please
(Lucas if I want the expensive stuff)...
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)