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If used with text on the side I would go for: 1-emphasis on the screen which is essential in coding :) 4-emphasis on the book which means knowledge
Issues: - none of these icons would work without description on the right - I don't thing mouse is the coding 'device' - 'Play' can be easily missed, I've not seen it for quite a long time :)
How about 5th approach: only 'play' icon and '<code>' symbols
Good work
