message: Update count-all-valid-pickup-and-delivery-options.py
diff: @@ -10,6 +10,5 @@ class Solution(object):
  MOD = 10**9+7
  result = 1
  for i in reversed(xrange(2, 2*n+1, 2)):
  - print i
  result = result * i*(i-1)//2 % MOD
  return result
  