Why are there two blocks of Greek characters in the Unicode Standard?

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Why are there two blocks of Greek characters in the Unicode Standard?

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The layout of the Greek script in the Unicode Standard is an artifact of the history of Unicode and of ISO/IEC 10646. The Unicode Standard started out with just the Greek block (U+0370..U+03FF), with Greek characters laid out in compatibility with the modern Greek monotonic standard, ISO/IEC 8859-7, and with additions for some Coptic, ancient Greek, and Greek symbol letters. When the Unicode Standard had the repertoire from drafts of ISO/IEC 10646 merged in, as part of the standards compromise which resulted in the synchronization of the Unicode Standard and 10646, the Unicode Standard acquired a collection of pre-composed Greek characters which were intended for polytonic Greek usage. Those had to be placed somewhere, and a “compatibility” block was created at U+1F00..U+1FFF to accommodate them.

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