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Gleaming the Cubes
Time Limit: 1000MSMemory Limit: 10000K
Total Submissions: 1507Accepted: 803


As chief engineer of the Starship Interprize, the task of repairing the hyperstellar, cubic, transwarped-out software has fallen on your shoulders. Simply put, you must compute the volume of the intersection of anywhere from 2 to 1000 cubes.


The input consists of several sets of cubes for which the volume of their intersections must be computed. The first line of each set contains a number (from 2 to 1000) which indicates the number of cubes which follow, one cube per line. Each line which describes a cube contains four integers. The first three integers are the x, y, and z coordinates of the corner of a cube, and the fourth integer is the positive distance which the cube extends in each of the three directions (parallel to the x, y, and z axes) from that corner.

Following the data for the first set of cubes will be a number which indicates how many cubes are in a second set, followed by the cube descriptions for the second set, again one per line. Following this will be a third set, and so on.A number =0 indicate the end of input.


Your program should process sets all of cubes, outputting the volume of their intersections to the output file, one set per line, until a zero is read for the number of cubes.

Sample Input

0 0 0 10
9 1 1 5
0 0 0 10
9 1 1 5
8 2 2 3

Sample Output



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