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He gave me an ultimatum.

He is an expert in international law.

I am majoring in cytology at university.

Cybernetics is a discipline that integrates information theory and control theory.

My father is an expert in viticulture.

The problem of finding the least common multiple is one of the basic problems in mathematics.

They learned about the least common multiple in math class.

Cone cells are the main visual receptors for recognizing colors.

Bok choy is one of my favorite vegetables.