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Constant speed, time, and distance/7
Constant speed, time, and distance/6
Constant speed, time, and distance/5
Constant speed, time, and distance/4
Constant speed, time, and distance/3
Constant speed, time, and distance/2
Constant speed, time, and distance/1
Arithmetical Problems and Percentages/V
Arithmetical Problems and Percentages/IV
Arithmetical Problems and Percentages/III
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 is a set of natural numbers that can be defined by a formula of first-order Peano arithmetic. The arithmetical sets are classified by the arithmetical hierarchy.)
 is a set of natural numbers that can be defined by a formula of first-order Peano arithmetic. The arithmetical sets are classified by the arithmetical hierarchy.)
 is a set of natural numbers that can be defined by a formula of first-order Peano arithmetic. The arithmetical sets are classified by the arithmetical hierarchy.)