Explanation:

- Articles 14 and 15: These articles guarantee equality before the law and prohibition of discrimination. They can be suspended during an emergency.

- Articles 19 and 20: Article 19 can be suspended but Article 20, which grants protection in respect of conviction for offenses, cannot be suspended during an emergency.

- Articles 20 and 21: Both Articles 20 and 21, which protect against arbitrary conviction and life and personal liberty, cannot be suspended during an emergency.

- Articles 21 and 22: Article 21 cannot be suspended, but Article 22, which deals with certain rights in cases of arrest and detention, can be.