This program has recursivity.

This problem can be solved with a recursive approach.

He used himself as a reflexive pronoun.

Understanding the algorithm of the regression tree is difficult.

Using tail recursion can sometimes improve the performance of a program.

His explanation was impossible to understand.

It is important to understand the importance of health.

Reflexive verbs are used to express actions where the subject is acting on itself.

Object-oriented programming is an important method for improving the efficiency of software development.

Natural language understanding is an important field of artificial intelligence.