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How to check if object (variable) is defined in R?

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Where is Erlang used and why? [closed]

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Batch file to delete files older than N days

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How can I filter a Django query with a list of values?

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How do I create a MongoDB dump of my database?

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What does “abstract over” mean?

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How do I send a POST request with PHP?

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How to convert Java String into byte[]?

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Encrypt and decrypt a string in C#?

... EDIT 2013-Oct: Although I've edited this answer over time to address shortcomings, please see jbtule's answer for a more robust, informed solution. https://stackoverflow.com/a/10366194/188474 Original Answer: Here's a work...
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Random number generation in C++11: how to generate, how does it work? [closed]

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