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              1 - Linear equations in one variable (easy)              
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              20 easy questions
            
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              2 - Linear equations in one variable (medium)              
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              26 medium questions
            
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              3 - Linear equations in one variable (hard)              
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              25 hard questions
            
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              4 - Linear functions (easy)              
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              11 easy questions
            
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              5 - Linear functions (medium)              
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              51 medium questions
            
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              6 - Linear functions (hard)              
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              58 hard questions
            
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              7 - Linear equations in two variables (easy)              
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              8 easy questions
            
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              8 - Linear equations in two variables (medium)              
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              33 medium questions
            
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              9 - Linear equations in two variables (hard)              
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              58 hard questions
            
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              10 - Systems of two Linear equations in two variables (easy)              
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              9 easy questions
            
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              11 -Systems of two Linear equations in two variables (medium)              
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              13 medium questions
            
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              12 -Systems of two Linear equations in two variables (hard)              
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              53 hard questions
            
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              13 Linear inequalities in one or two variables (easy)              
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              4 easy questions
            
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              14 Linear inequalities in one or two variables (medium)                
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              12 medium questions
            
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              15 Linear inequalities in one or two variables (hard)                
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              28 hard questions
            
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              16 Nonlinear functions (easy)                
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              12 easy questions
            
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              17 Nonlinear functions (medium)                
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              34 medium questions
            
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              18 Nonlinear functions (hard)                
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              83 hard questions
            
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              19 Nonlinear equations in one variable and systems of equations in two variables (easy)                
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              8 easy questions
            
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              20 Nonlinear equations in one variable and systems of equations in two variables (medium)                
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              21 medium questions
            
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              21 Nonlinear equations in one variable and systems of equations in two variables (hard)                
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              60 hard questions
            
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              22 Equivalent-expressions (easy)                
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              6 easy questions
            
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              23 Equivalent-expressions (medium)                
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              22 medium questions
            
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              24 Equivalent-expressions (hard)                
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              21 hard questions
            
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              25 ratios rates proportional relationships and units (easy)                
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              13 easy questions
            
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              26 ratios rates proportional relationships and units (medium)              
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              16 medium questions
            
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              27 ratios rates proportional relationships and units (hard)              
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              32 hard questions
            
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              28 Percentages (easy)              
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              12 easy questions
            
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              29 Percentages (medium)              
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              5 medium questions
            
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              30 Percentages (hard)              
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              39 hard questions
            
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              31 One variable data distributions and measures of center and spread (easy)              
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              14 easy questions
            
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              32 One variable data distributions and measures of center and spread (medium)              
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              8 medium questions
            
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              33 One variable data distributions and measures of center and spread (hard)              
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              20 hard questions
            
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              34 Two variable data models and scatterplots (easy)              
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              5 easy questions
            
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              35 Two variable data models and scatterplots (medium)              
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              12 medium questions
            
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              36 Two variable data models and scatterplots (easy)              
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              13 hard questions
            
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              37 probability and conditional probability (easy)                
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              6 easy questions
            
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              38 Probability and conditional probability (medium)                
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              6 medium questions
            
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              39 probability and conditional probability (hard)                
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              10 hard questions
            
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