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Summarizing multiple columns with dplyr? [duplicate]

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Retargeting solution from .Net 4.0 to 4.5 - how to retarget the NuGet packages?

...NET 4.0 in VS2010 to VS2012 and now I would like to re-target it to .Net 4.5 5 Answers ...
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Xcode Project vs. Xcode Workspace - Differences

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Git submodule push

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Difference between Repository and Service Layer?

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What is the relationship between UIView's setNeedsLayout, layoutIfNeeded and layoutSubviews?

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What’s the difference between ScalaTest and Scala Specs unit test frameworks?

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How do I reflect over the members of dynamic object?

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How to resize a VirtualBox vmdk file

...k" "cloned.vdi" --format vdi VBoxManage modifymedium "cloned.vdi" --resize 51200 VBoxManage clonemedium "cloned.vdi" "resized.vmdk" --format vmdk The above will resize the hard disk up to 50GB (50 * 1024MB). To complete things you need to resize the drive too! To achieve this, you might want to ...
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Erlang's 99.9999999% (nine nines) reliability

...lity (yes, you read that right, 99.9999999%). Let’s put this in context: 5 nines is reckoned to be good (5.2 minutes of downtime/year). 7 nines almost unachievable ... but we did 9. Why is this? No shared state, plus a sophisticated error recovery model. If you dig a bit deeper, in the PhD thesis...