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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’.