He is always seeking a perfect character.

He used a string as a rope to tie up the luggage.

I am raising funds to start a new business.

The content of this book is very high quality.

The demand of the market is always changing.

Believing that failure is a stepping stone to success, he challenged again.

My younger brother loves motocross and works hard at practice every weekend.

I use yeast to make bread.

This plan was made based on facts.

A lower triangular matrix is a matrix where all the elements below the main diagonal are zero.