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The '4' is open.
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The sides of the lower-case 'y' are parallel (U-shaped).
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The upper-case letter 'I' is plain.
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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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The '4' is closed.
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The sides of the lower-case 'y' are angled (V-shaped).
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The upper-case letter 'I' has serifs/bars.
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