import numpy as np

class Plate:
    def __init__(self, h, s, z):
        self.height = []
        self.space = s
        self.zombies = z

def addToPlates(plates, R, i, x, y):
    print(plates)
    newSpace = [x-R/2, x+R/2, y+R/2, y-R/2]
    newPlate = Plate(1, newSpace, [i])
    toAdd = []
    for p in plates:
        if newSpace[0] <= p.space[1] and newSpace[1] >= p.space[0] and newSpace[2] > p.space[3] and newSpace[3] < p.space[2]:
            # Overlap
            overlapSpace = [max(newSpace[0], p.space[0]), min(newSpace[1], p.space[1]), min(newSpace[2], p.space[2]), max(newSpace[3], p.space[3])]
            print(p.zombies)
            overlapPlate = Plate(newPlate.height + p.height, overlapSpace, p.zombies.extend(newPlate.zombies))
            toAdd.append(overlapPlate)
    plates.append(newPlate)
    plates.extend(toAdd)

def solve(N, R, XY):
    # print("N={0}, R={1}, XY={2}".format(N, R, XY))

    # Create plates
    plates = []
    for i, xy in enumerate(XY):
        x, y = xy
        addToPlates(plates, R, i, x, y)
    print(plates)
    return 'white'

if __name__ == "__main__":
    import fileinput
    f = fileinput.input()

    T = int(f.readline())
    for case in range(1, T+1):
        N, R = [int(i) for i in f.readline().split()]
        XY = [[int(i) for i in f.readline().split()] for x in range(N)]
        solution = solve(N, R, XY)
        print("Case #{0}: {1}".format(case, solution))