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Why can't I center with margin: 0 auto?

I have a #header div that is 100% width and within that div I have an unordered list. I have applied margin: 0 auto to the unordered list but it won't center it within the header div. ...
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How do I calculate the normal vector o<em>fem> a line segment?

Suppose I have a line segment going <em>fem>rom (x1,y1) to (x2,y2). How do I calculate the normal vector perpendicular to the line? ...
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What does it mean when git says a <em>fem>ile “needs update”?

I can't <em>fem>or the li<em>fem>e o<em>fem> me <em>fem>ind any decent explanation o<em>fem> the "[<em>fem>ile]: needs update" message that git sometimes spits out <em>fem>rom time to time. Even the o<em>fem><em>fem>icial git <em>Fem>AQ has explaining this marked as a TODO. I<em>fem> someone could explain A) what it means; and B) how to <em>fem>ix it, I would be extremely grate<em>fem>u...
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Programmatically <em>fem>ire button click event?

Is there a way to programmatically <em>fem>ire a button click event? I have a button placed there in an UIView, and in a particular scenario i want to click the button via code, not manually as a user. Is it possible in iOS development? Please provide your suggestions and guide me how to do that. ...
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When should I use <em>Fem>ile.separator and when <em>Fem>ile.pathSeparator?

In the <em>Fem>ile class there are two strings, separator and pathSeparator . 3 Answers ...
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Why is parenthesis in print voluntary in Python 2.7?

In Python 2.7 both the <em>fem>ollowing will do the same 4 Answers 4 ...
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How can I expand the <em>fem>ull path o<em>fem> the current <em>fem>ile to pass to a command in Vim?

When I go to command mode and type 6 Answers 6 ...
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Get generated id a<em>fem>ter insert

I'm using the SQLite with Android, and I want to know the best way to get the generated id o<em>fem> the row I inserted. 5 Answers...
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What is the di<em>fem><em>fem>erence between setUp() and setUpClass() in Python unittest?

What is the di<em>fem><em>fem>erence between setUp() and setUpClass() in the Python unittest <em>fem>ramework? Why would setup be handled in one method over the other? ...
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Running multiple TeamCity Agents on the same computer?

We have several build machines, <em>eacem>h running a single TeamCity build agent. <em>Eacem>h machine is very strong, and we'd like to run several build agents on the same machine. ...