Use fewer when referring to countable objects.
Use less when referring to abstract, inseparable, continuous, or otherwise uncountable quantities.
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Yes:
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You need fewer components to assemble device A than you need to assemble device B.
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Yes:
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You need less time to assemble device A than you need to assemble device B.
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Yes:
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The fewer devices you connect, the less cable you need.
(Applies if the cable is on a drum and you need to cut it off.)
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Yes:
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The fewer devices you connect, the fewer cables you need.
(Applies if you already have discrete, ready-to-use, short cables.)
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