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var sum=""
rowLoop: for row in 0...7{
  colLoop: for col in 0...7{
    if row == col {
      print(sum)
      sum = ""
      continue rowLoop
    }
    sum += String(row*col) + " "
  }
}

/*
0 
0 2 
0 3 6 
0 4 8 12 
0 5 10 15 20 
0 6 12 18 24 30 
0 7 14 21 28 35 42 
*/