The use of the four background colors to distinguish different types of
examples is good.
It would be nice if the doc had a key to the use of each color (shell, .i, .cc,
The PDF of the doc does not use these colors, presumably to save ink
(good idea). A good compromise would be if the PDF would draw an
outline box around each example using these colors. This would use very
little ink but would help in identifying the type of each example.
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