import math
"""
def return_sum(result):
sum = 0
for i,j in result:
sum += ptc[i-1][j-1]
return sum
def combination(n, r):
return int((math.factorial(n)) / ((math.factorial(r)) *
math.factorial(n - r)))"""
"""
def pascals_triangle(rows):
result = []
for count in range(rows):
row = []
for element in range(count + 1):
row.append(combination(count, element))
result.append(row)
return result"""
#ptc = pascals_triangle(50)
ptc = [i+1 for i in range(50)]
t = int(input())
for t in range(t):
n = int(input())
if n <= 30:
result = [[i,1] for i in range(1,n+1)]
#print(result)
else:
result = []
left = True
bin = '{0:b}'.format(n-30)[-1::-1]
zeros = bin.count('0')
current_row = 0
#print(zeros)
for i,bit in enumerate(bin):
if bit == '1' and left:
for c in range(ptc[i]):
result.append([i+1,c+1])
left = False
current_row = i+1
elif bit == '1' and not left:
for c in range(ptc[i],0,-1):
result.append([i+1,c])
left = True
current_row = i+1
else:
if left:
result.append([i+1,1])
current_row = i+1
else:
result.append([i+1,ptc[i]])
current_row = i+1
for c in range(30-zeros):
if left:
result.append([current_row+c+1,1])
else:
result.append([current_row+c+1,ptc[current_row+c]])
print("Case #{}:".format(t+1))
for i,j in result:
print(i,j,sep = " ")
#print(return_sum(result))
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