Combinatorial mathematics is a branch of mathematics that studies the combinations of things.

I am deeply grateful for your help.

He always acts with the words 'to thine own self be true' in mind.

Thanks to you, I was saved, not at all.

After the meal, he said 'there is luck in leftovers', and ate everything cleanly.

The SI system is a standard unit system used worldwide.

He publicly announced that he is bisexual.

There is a proverb that says, 'Plan your day in the morning and your year on New Year's Day,' which means that you should plan your day in the morning and your year on New Year's Day.

He took a deep breath and chanted, 'a vi ra hūṃ khaṃ svāhā.'

I'm sincerely sorry for being late.