Prompt $-$ Answer the following questions:

Question $1)$ Describe a set. Provide a a code snippet with common operations.

Question $2)$ Describe dictionary. Provide a a code snippet with common operations.

Question $3)$ Describe a hashing technique.

Question $4)$ Assume that the set s contains the number $3.$ Write the sequence of sets $($for each line below$)$ resulting from the following operations:

s$.$add$(4)$

s$.$add$(4)$

s$.$add$(5)$

s$.$remove$(3)$