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2.3 p.102: 37,39*,42*,47
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2.4 p.114: Just do the proof for the following (no need for the diagram) - 15,16,17,18
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2.5 p.124: 3a,12*,17,19,35,36*,37,38,39,40,55,56
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2.6 p.137: 3,15,17,23,26,27 (hint: see example 5),47 (no graph is necessary),49* (no graph is necessary)
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