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For `units`

, numbers are just another kind of unit. They can
appear as many times as you like and in any order in a unit expression.
For example, to find the volume of a box that is 2 ft by 3 ft by 12 ft
in steres, you could do the following:

You have: 2 ft 3 ft 12 ft You want: stere * 2.038813 / 0.49048148 You have: $ 5 / yard You want: cents / inch * 13.888889 / 0.072

And the second example shows how the dollar sign in the units conversion
can precede the five. Be careful: `units`

will interpret
‘`$5`’ with no space as equivalent to ‘`dollar^5`’.