The '4' is closed.
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The centre vertex of the upper-case 'M' is on the baseline.
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The 'l' (lower-case 'L') has no serifs or tail.
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The lower-case 'u' has a stem/serif.
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The upper-case 'W' vertices are flat at the top and bottom.
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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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