* It must be useful, and this usefulness must be measurable. * Device must be easily extensible. ** On software level: ### It should be relatively . . .
* It must be useful, and this usefulness must be measurable. * Device must be easily extensible. ** On software level: ### It should be relatively . . .
* It must be useful, and this usefulness must be measurable. * Device must be easily extensible. ** On software level: ### It should be relatively . . .
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