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Counting in tens

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  • 0, 10, 20, ....., 40
    30
  • 20, 30, 40, ....., 60
    50
  • 0, 10, 20, 30, ...., 50
    40
  • 30, 40, 50, ....., 70
    60
  • 0, 10, ....., 30, 40, 50
    20
  • 30, 40, 50, 60, ...., 80
    70
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