new_contents: # !/usr/bin/env python3
  # -*- coding: utf-8 -*-
  
  rows = []
  rows[1] = [0, 0, 0, 2, 6, 0, 7, 0, 1]
  rows[2] = [6, 8, 0, 0, 7, 0, 0, 9, 0]
  rows[3] = [1, 9, 0, 0, 0, 4, 5, 0, 0]
  rows[4] = [8, 2, 0, 1, 0, 0, 0, 4, 0]
  rows[5] = [0, 0, 4, 6, 0, 2, 9, 0, 0]
  rows[6] = [0, 5, 0, 0, 0, 3, 0, 2, 8]
  rows[7] = [0, 0, 9, 3, 0, 0, 0, 7, 4]
  rows[8] = [0, 4, 0, 0, 5, 0, 0, 3, 6]
  rows[9] = [7, 0, 3, 0, 1, 8, 0, 0, 0]
  
subject: Add sample Sudoku puzzle