I find that commerical speed figs (like BRIS) do a good enough job handling time and variants. I have put my extra effort into using feet per second approaches for an alternative views to speed figs. The commercial companies have deep pockets and resources to be able, in general, to produce a better speed fig than the lone handicapper can.
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"The Law, in its majestic equality, forbids the rich, as well as the poor, to sleep under bridges, to beg in the streets, and to steal bread."
Anatole France
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