The Combining Half Marks block specifies 7 characters.

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Combining Half Marks Block

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U+FE20 ︠ ︠ COMBINING LIGATURE LEFT HALF
U+FE21 ︡ ︡ COMBINING LIGATURE RIGHT HALF
U+FE22 ︢ ︢ COMBINING DOUBLE TILDE LEFT HALF
U+FE23 ︣ ︣ COMBINING DOUBLE TILDE RIGHT HALF
U+FE24 ︤ ︤ COMBINING MACRON LEFT HALF
U+FE25 ︥ ︥ COMBINING MACRON RIGHT HALF
U+FE26 ︦ ︦ COMBINING CONJOINING MACRON