Greek alphabet vowel characters with 2.3.3.3

[Gintaras]

Here works too. I used this code to test:
Macro (ϊ)

Code:

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act "Notepad"
key "970 (ϊ) and 971 (ϋ) are displayed as 943 (ί) and 973 (ύ)"

How this works?
Macro (ϊ)

Code:

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key (0x40000|970) ;;ϊ