About the Icons
Throughout this volume, icons are used to identify materials of interest.
These icons serve several purposes:
The BACKGROUND icon identifies the bigger picture and places the current
discussion into a broader context.
The TIP icon highlights a good practice to follow or something that has
worked successfully for us.
The EXAMPLE icon highlights stories and illustrations of general principles.
The CAUTION icon indicates an area where you should be careful. These
are especially intended to help beginners spot potholes or potential roadblocks.
The CHECKLIST icon identifies a list of items that are good to think about.
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