RFC 4042:UTF-9 and UTF-18 Efficient Transformation...
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private use

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... U+E0041 TAG LATIN CAPITAL LETTER A 416 400 101 U+10FFFD <Plane 16 Private Use, Last> 420 777 375 0x345ecf1b (UCS-4 value not in [UNICODE ...

7 - 8 - A - B - C - E - F - G - I - L - M - N - O - P - R - S - T - U - V - X

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