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The '4' is open.
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The top storey of the '3' is a sharp angle.
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The leg of the upper-case 'R' is straight.
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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 top storey of the '3' is a smooth curve.
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The leg of the upper-case 'R' is curved outwards.
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