688 B | 688 chars
import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def dis(a, b):
return abs(a[0] - b[0]) + abs(a[1] - b[1])
def solve():
n = ii()
l = sorted([mii() for _ in range(n)])
mn = 111111111111
ans = []
for i in range(n):
for j in range(i + 1, n):
if mn > dis(l[i], l[j]):
mn = dis(l[i], l[j])
ans = [i, j]
print(*l[ans[0]],*l[ans[1]])
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
solve()