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Interfaces, Abstract classes, Enums classes Interfaces, Abstract classes, Enums lists_check Interfaces, Abstract classes, Enums code_style

Badge for "Interfaces, Abstract classes, Enums" chapter from Java course.

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- "Hipparcos"
Answered at least once on all free questions in "Interfaces, Abstract classes, Enums" chapter of "Java" course.

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Answered at least once correctly on all free questions in "Interfaces, Abstract classes, Enums" chapter of "Java" course.

- "Toliman"
Completed free "Interfaces, Abstract classes, Enums" chapter of "Java" course.

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