Combinatorics is a branch of mathematics that studies combinations of things.

Combinatorics is a branch of mathematics dealing with issues of order and choice.

Discrete mathematics is an important field that forms the basis of computer science.

It is important for each person to fulfill their role.

He acted according to my instructions one by one.

Lithium aluminium hydride is necessary for this chemical reaction.

Debuccalization refers to the phenomenon in phonetics where a specific sound is pronounced outside the oral cavity.

Decolonization is an important process for many countries to achieve independence.

The first day of the month is the beginning of a new month.

I have been to France once.