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[Alexandr Korol]

1. 7 days in a week:
The week consists of seven days, a standard adopted worldwide with deep roots in ancient astronomical observations.

2. 7 continents:
The Earth is divided into seven continents: Africa, Antarctica, Asia, Australia, Europe, North America, and South America.

3. 7 chakras:
In yoga and Ayurveda, there is a concept of seven chakras — energy centers in the body, each connected to certain physical and spiritual aspects.

4. 7 seas:
In historical and geographical contexts, the “seven seas” are often mentioned, though the list is symbolic or cultural rather than strictly real.

5. 7 color games:
Children often learn the colors of the rainbow through the acronym “Roy G. Biv” in English, representing all seven rainbow colors.

6. 7 heads of the Hydra:
In mythologies like Greek, creatures with seven heads appear, such as the Lernaean Hydra, famous because when one head was cut off, two grew in its place.

7. 7 levels of difficulty:
In some games, puzzles, or tasks, there is often a seven-level difficulty distribution, for example, from beginner to expert.