Sure! Here are some practice questions related to nested lists:

Define a nested list called nested$\_$list with the following structure: $[[1,2,3],[4,5],[6]].$

Write a function named sum$\_$nested$\_$list$($nested$\_$list$)$ that takes a nested list as input and returns the sum of all the numbers contained in all sublists.

Call the sum$\_$nested$\_$list$()$ function with nested$\_$list as the argument and print the result.

Create a function called count$\_$elements$($nested$\_$list$)$ that returns the total number of elements across all sublists in the nested list.

Write a function named flatten$($nested$\_$list$)$ that takes a nested list and returns a single flattened list containing all the elements.

Given the nested list nested$\_$list $=[[1,2,[3,4]],[5,6]],$ write a function deep$\_$flatten$($nested$\_$list$)$ that flattens the list, including any nested lists inside the sublists. solve $4$ from here