CHOICE

                       CHOOSING THE PARAMETERS TO USE
     :MAKEIT athingof[;SIZEOF=[height[,width[,depth[,color]]]]]

We aren't forced to choose a "width" or "depth" -- BRACKETS [ ] let you
know that the choice is yours.

We might decide NOT to specify a "width" or a "depth".  That's fine.
There might be good reasons for leaving them out.  We could try:

                 makeit barn;sizeof=75,red

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:: BUT THE COMPUTER WOULD REJECT THE COMMAND IF WE TYPED IT THIS WAY  ::
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                                  Why?

"Width" and "height" are optional.  No question about it.  But in this
case, the COMMAS are required.  True, there are no braces { } to show
that the commas are needed.  How do you know what to do?

The answer is in the way the pairs of brackets fit inside each other.
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