Given N regular rectangles in a sequence. Following this sequence you have to draw every rectangles if it does not overlap with any rectangle which has been drawn already. Calculate the total area of drawn rectangles. Note: A rectangle is regular if and only if its sides are all parallel to the axis. Input The first line of the input contains the number of test cases T (1 ≤ T ≤ 100). Each case starts with a single line containing N (0 ≤ N ≤ 10000), the number of rectangles in the sequence. Next N lines will represent the sequence of rectangles. Each of the next N lines will represent one rectangle having four integers x1, y1, x2, y2 (−100 < x1, y1, x2, y2 < 100, x1 < x2, y1 < y2), here (x1, y1) is the lower left corner of the rectangle and (x2,y2) is the upper right corner of the rectangle. Output For each test case, print the case number and a single integer, the total area covered by rectangles you drew. Sample Input 1 3 -1 -1 1 1 0 0 10 10 1022 Sample Output Case 1: 6