not always rounded to the closest three-digit number to the theoretical geometric sequence:

:R5: 1.00 1.60 2.50 4.00 6.30

Examples

* If some design constraints were assumed so that two screws in a gadget should be placed between 32 mm and 55 mm apart, the resulting length would be 40 mm, because 4.00 is in the R5 series of preferred numbers.
* If a set of nails with lengths between roughly 15 and 300 mm should be produced, then the application of the R5 series would lead to a product repertoire

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