Designers of digital equipment are
fully aware of the difficulties of testing
their designs to confirm that the logic
of the design works according to plan.
Even more difficult, rather as with computer
programs, is the ability to conduet the
infinite number of tests to prove that there
are no bugs or glitches in the design some
of which may only appear when an unusual
set of conditions exists, or perhaps only
once every billion clock pulses or so.
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