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[Alexandr Korol]

1. Four seasons: Spring, summer, autumn, and winter make up the four times of the year.
2. Four blood groups: Human blood groups are divided into A, B, AB, and O. 3. Four unique DNA nucleotides: Adenine (A), guanine (G), cytosine (C), and thymine (T) form the four main molecules in the DNA structure.
4. Four great ancient Greek philosophers: Socrates, Plato, Aristotle, and Democritus. 5. Four elements: In ancient philosophy and alchemy, it was believed that everything consists of four elements: earth, air, fire, and water.
6. Four suits in a deck of cards: Hearts, spades, clubs, and diamonds.
7. Four chess pieces: Pawn, rook, knight, and bishop.
8. Four main wind directions: North, south, east, and west.
9. Four risk groups in the stock market: Low risk, moderate risk, high risk, and speculative risk.
10. Four houses in the Harry Potter universe: Gryffindor, Hufflepuff, Ravenclaw, and Slytherin.

1. Four Horsemen of the Apocalypse: In biblical mythology, these are war, famine, pestilence, and death.
2. Four main types of human activity in society: Economy, culture, politics, and society.
3. Four stages of life in Hinduism: Brahmacharya (studenthood), Grihastha (family life), Vanaprastha (retirement), and Sannyasa (asceticism).
4.Four pillars of Islam: Namaz (prayer), Zakat (charity), Sawm (fasting), and Hajj (pilgrimage).
5. Four types of tennis court surfaces: Clay, grass, hard court, and carpet.
6. Four official languages of Switzerland: German, French, Italian, and Romansh. 7. Four invariant properties in physics: Mass, charge, spin, and baryon number. 8. Four basic tastes in cooking: Sweet, salty, sour, and bitter.
9. Four main types of animals in classification: Mammals, birds, fish, and reptiles. 10. Four main art schools of the Renaissance: Florentine, Roman, Venetian, and Northern.