import math

# function to compute the average distance between all pairs of points
def average_distance(points):
    n = len(points)
    total_distance = 0
    for i in range(n):
        for j in range(i+1, n):
            dx = points[i][0] - points[j][0]
            dy = points[i][1] - points[j][1]
            distance = math.sqrt(dx*dx + dy*dy)
            total_distance += distance
    return total_distance / (n*(n-1)/2)

# read number of test cases
t = int(input())

# process each test case
for case in range(1, t+1):
    # read input
    n, m, k = map(int, input().split())
    points = [tuple(map(int, input().split())) for i in range(n)]
    queries = [tuple(map(int, input().split())) for i in range(m)]

    # compute the average distance for each query
    results = []
    for query in queries:
        subset = [points[i-1] for i in query]
        results.append(average_distance(subset))

    # print output
    print(f"Case #{case}: {' '.join(f'{r:.7f}' for r in results)}")