[1] W3Schools (201X) Bootstrap 4 Tutorial, retrieved December 20, 2016 from http://www.w3schools.com/bootstrap4/default.asp
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BS4 Home
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BS4 Get Started
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BS4 Grid Basic
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BS4 Typogrpahy
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BS4 Images
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BS4 Jumbotron
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BS4 Buttons
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BS4 Glyphicons
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BS4 Navbar
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BS4 Media Objects
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BS4 Carousel
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BS4 Model
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BS4 Tooltip
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BS4 Affix
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Bootstrap 4 Grids
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Bootstrap 4 Themes
[2] Webslides https://webslides.tv/
[3]