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<p>The first grapheme cluster here contains three code points: two characters (Lo unicode category) which join up to be drawn with a single glyph, and a third code point which is a nonspacing mark (Mn unicode category), which is drawn as a second glyph on top of the first glyph, using a negative advance. This run has an initial advance.</p>
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<span style="font-size: 100pt; background: blue;">&#1604;&#1575;&#1611; &#1609; z</span></body>
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