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    1. Equation Puzzle 1
      Format: variable-1 + variable-2 = a value (sum of the two variables)
            value of the variables range from 1 to 9
            group of 8 equations

    2. Equation Puzzle 2
      Format: variable-1 + variable-2 = a value (sum of the two variables)
      and / or: variable-1 + variable-2 + variable-3 = a value (sum of the three variables)
            value of the variables range from 1 to 9
            group of 7 equations

    3a. Equation Puzzle 3a
      Format: variable-1 + variable-2 = a value (sum of the two variables)
      and / or: variable-1 + variable-2 + variable-3 = a value (sum of the three variables)
            value of the variables range from 1 to 9
            group of 6 equations

    3b. Equation Puzzle 3b
      Format: variable-1 + variable-2 = a value (sum of the two variables)
      and / or: variable-1 + variable-2 + variable-3 = a value (sum of the three variables)
            value of the variables range from 1 to 9
            group of 7 equations

    4a. Equation Puzzle 4a
      Format: variable-1 + variable-2 = a value (sum of the two variables)
      and / or: variable-1 + variable-2 + variable-3 = a value (sum of the three variables)
            value of the variables range from 1 to 9
            group of 7 equations

    4b. Equation Puzzle 4b
      Format: variable-1 + variable-2 = a value (sum of the two variables)
      and / or: variable-1 + variable-2 + variable-3 = a value (sum of the three variables)
            value of the variables range from 1 to 9
            group of 8 equations

    5. Equation Puzzle 5
      Format: variable-1 + variable-2 = variable-3 (sum of the two variables)
            value of the variables are printed at the top of that page

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