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(linear algebra) identity matrix
An identity matrix is a square matrix in which all the elements on the diagonal are 1 and all other elements are 0.
a short novel, novella, short story
He is good at writing short novels.
fresh water
This lake is filled with fresh water.
coal
He works digging out coal.
a word, a shortest part that means something in a sentence
It's difficult to remember new words.
carbohydrates
Carbohydrates are important as a source of energy.
birth (regal) / (Christianity) nativity
People from all over the country gathered to celebrate the emperor's birth.
apportionment, allotment, division
How was the apportionment of this project decided?
simple / pure / free
This problem is simple, so it can be solved quickly.
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