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In Segment 18, you learned that this book introduces many
templatelike, general-purpose program patterns, called idioms, which you
can fill in to suit your own specific purposes. In these patterns, each
place to be filled in is identified by a box that contains a description of
the item to be inserted, such as this.
The following, for example, is the pattern that you use when you want to display the answer produced by an expression in the transcript:
Transcript show: expression printString
When you fill in such a pattern, replacing descriptions with specific instances, you are said to instantiate the pattern.