Find the least number of times it is necessary to lift a pencil from the paper when

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Find the least number of times it is necessary to lift a pencil from the paper when drawing each of the graphs in Exercises 1-7 without retracing any part of the graph.
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Find the least number of times it is necessary to
Find the least number of times it is necessary to
Find the least number of times it is necessary to
Find the least number of times it is necessary to
Find the least number of times it is necessary to
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