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(games) sudoku (a type of puzzle)
I like solving sudoku puzzles every day.
(physics) Reynolds number
The Reynolds number is an important concept in fluid dynamics.
an irrational number
An irrational number is a number that cannot be expressed as a fraction.
quantum number
Quantum number is an important concept in physics.
a few days
His birthday will come in a few days.
(grammar) ordinal number
He came in first place in the race.
a male given name
Masakazu is my best friend.
Kazuo is my best friend.
Kazuto-kun is my best friend.
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