You need a "N/A" answer for a lot of those. How am I supposed to be satisfied or dissatisfied with the color, for instance, on a device without a color display? How should I answer for the ease of using DRM-locked ebooks when I will not buy any such books? I answered your survey, but a bunch of my answers are going to be marginally useless because the real but unavailable answer was "N/A".
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