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As a data point, I'm strongly proficient in one (Objective-C) but use PHP,HTML,CSS and a small amount of JS to supplement the data handling, web services, and create the web site side of my mobile apps. I can get done what I need to in those other 4, but I can't sit down and hack out a whole project like I can Obj-C.

I'm also strongly proficient in Adobe Illustrator, Photoshop, and InDesign though, so I don't know if that offsets my proficiency in only one language.

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