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Double numbers to 20

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  • double 8
    16
  • double 4
    8
  • double 3
    6
  • double 10
    20
  • double 5
    10
  • double 1
    2
  • double 9
    18
  • double 7
    14
  • double 2
    4
  • double 6
    12
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