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I certainly think about one these days. Plus, we need different color/arrow for the nature of the surface (silly example - metal - less dangerous, plastic - more dangerous)
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from the point of view of my workspace--- 0 degree: stuff on my desk 1 degree: stuff in my cupboard (need to go to bedroom to access) 2 degree: stuff in storage-space (workspace->living space ; living-space->storage-space) 3 degrees: stuff in neighborhood bakery
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