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Colophon

Our look is the result of reader comments, our own experimentation, and feedback from distribution channels. Distinctive covers complement our distinctive approach to technical topics, breathing personality and life into potentially dry subjects.

The animal on the cover of Learning Perl, Fourth Edition is a llama, a relation of the camel native to the Andean range. Also included in this llamoid group is the domestic alpaca and their wild ancestors, the guanaco and the vicuna. Bones found in ancient human settlements suggest that domestication of the alpaca and llama dates back 4,500 years. In 1531, when Spanish conquistadors overran the Inca Empire in the high Andes, they found both animals present in great numbers. These llamas are suited for high mountain life; their hemoglobin can take in more oxygen than that of other mammals.

Llamas can weigh up to 300 pounds and are mainly used as beasts of burden. A packtrain may contain several hundred animals and can travel up to 20 miles per day. Llamas will carry loads up to 50 pounds, but have a tendency to be short-tempered and resort to spitting and biting to demonstrate displeasure. To the people of the Andes, llamas also provide meat, wool for clothing, hides for leather, and fat for candles. Their wool can also be braided into rope and rugs, and their dried dung is used for fuel.

Matt Hutchinson was the production editor for Learning Perl, Fourth Edition. GEX, Inc. provided production services. Genevieve d'Entremont, Sarah Sherman, and Colleen Gorman provided quality control.

Edie Freedman designed the cover of this book. The cover image is a 19th-century engraving from the Dover Pictorial Archive. Karen Montgomery produced the cover layout with Adobe InDesign CS using Adobe's ITC Garamond font.

David Futato designed the interior layout. This book was converted by Joe Wizda to FrameMaker 5.5.6 with a format conversion tool created by Erik Ray, Jason McIntosh, Neil Walls, and Mike Sierra that uses Perl and XML technologies. The text font is Linotype Birka; the heading font is Adobe Myriad Condensed; and the code font is LucasFont's TheSans Mono Condensed. The illustrations that appear in the book were produced by Robert Romano, Jessamyn Read, and Lesley Borash using Macromedia FreeHand MX and Adobe Photoshop CS.

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