Free ebooks on Puzzles.

A puzzle is a problem or enigma that tests the ingenuity of the solver. In a basic puzzle, one is intended to piece together objects (puzzle pieces) in a logical way in order to come up with the desired shape, picture or solution. Puzzles are often contrived as a form of entertainment, but they can also stem from serious mathematical or logistical problems — in such cases, their successful resolution can be a significant contribution to mathematical research.

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Free ebooks on PDF.

Portable Document Format (PDF) is a generic computer term.[citation needed] The best-known PDF implementation is Adobe PDF, a file format created by Adobe Systems in 1993 for document exchange. The remainder of this article discusses Adobe PDF exclusively.

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Java Struts EBook

Apache Struts is an open-source web application framework for developing Java EE web applications. It uses and extends the Java Servlet API to encourage developers to adopt a model-view-controller (MVC) architecture. It was originally created by Craig McClanahan and donated to the Apache Foundation in May, 2000. Formerly located under the Apache Jakarta Project and known as Jakarta Struts, it became a top level Apache project in 2005.

Struts2 is the rebranding of WebWork under the Apache Struts make.

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