The '4' is open.
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The dot on the '?' (question-mark) is square or rectangular.
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The top storey of the '3' is a smooth curve.
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The upper-case 'Y' arms and tail are separate strokes.
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The centre strokes of the upper-case 'W' form one centre stroke.
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Note that the fonts in the icons shown above represent general examples, not necessarily the two fonts chosen for comparison.
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