2. The formula for the distance between 2 points (r'y,a) and (T2,y2, 22) 1s given (x2- r1)2 + (y2 - yi)2 (22 21)2. Write a Python program, in a file called distance.py, to find the distance between all pairs of points in a two-dimensional list such as the following: points - [[4,2,1],[-1,3,5], [6,9,-2], [8,-1,5]] Output the coordinates of the two points that are closest to each other along with the distance between the points. Using insertion sort, output the distances between points in descending order. Your solution should include a function distance (a, b), where a and b are points represented by lists of (x,y, z) coor- dinates (ex. a=[4,2,1]), and a function to implement the insertion sort. Your sorting function should not use any built-in Python functions Sample input/output (for the points list above) Sorted distances: 12.37 11.58 9.85 7.87 6.48 6.40 Closest points were: [4, 2, 1] and [8, -1, 5] with distance-6.40