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Exercise 4
    1.  18 + 1 + 1 =
    2.  11 + 1 + 1 =
    3.  15 + 1 + 1 =
    4.  14 + 1 + 1 =
    5.  12 + 1 + 1 =
    6.  16 + 1 + 1 =
    7.  18 + 1 + 1 =
    8.  10 + 1 + 1 =
    9.  11 + 1 + 1 =
    10.  13 + 1 + 1 =
    11.  18 + 1 + 1 =
    12.  19 + 1 + 1 =
    13.  15 + 1 + 1 =
    14.  20 + 1 + 1 =
    15.  13 + 1 + 1 =
    16.  10 + 1 + 1 =
    17.  17 + 1 + 1 =
    18.  20 + 1 + 1 =
    19.  13 + 1 + 1 =
    20.  16 + 1 + 1 =

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