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> All for the sake of saving a "by 10"...
Language, especially spoken, works like that a lot - things are dropped when
they are not needed. Another common thing is to drop the units entirely if
they are not necessary, this happens *a lot*. Sometimes units are even
shortened to scientifically incorrect ones (eg I have heard "a speed limit
of 60 miles") but the point is that everyone understands what is meant, when
you are talking to friends casually you are not at a scientific conference -
and you'll likely be labeled as a jerk if you start saying things like "you
mean miles *per hour*?" in the conversation.
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