1) Yes in Portrait. In landscape an A4 is viewed in 3 steps, adjusting the side blank margins.
2) A normal McGraw or Apress book, yes, but font is a little small for my comfortability, however it can be read.
3) It depends of the amount of colors and size. Generally yes, but sometimes no.
4) It depend of the color. If the color is very clear, no. If the color is grayed from text, yes.
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