def dis(a,b)
return (a[0]-b[0])**2 + (a[1]-b[1])**2 + (a[2]-b[2])**2
end
for tc in 1..gets.to_i
n = gets.to_i
l = []
for i in 1..n
l << gets.split.map(&:to_i)
end
answers,mx = [0]*3
for i in 0..n-1
for j in i+1..n-1
crt = dis(l[i],l[j])
if mx < crt
mx = crt
answers = [[i,j]]
elsif mx == crt
answers << [i, j]
end
end
end
puts "Data Set #{tc}:"
answers.each do |answer|
puts "#{answer[0]+1} #{answer[1]+1}"
end
end