ipod <-
structure(list(song_length = c(0.90477629999999998, 0.2007149, 
0.83783430000000003, 0.60754390000000003, 0.3441459, 0.96628820000000004, 
0.81029039999999997, 0.57312969999999996, 0.30929259999999997, 
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0.4348127, 0.88559529999999997, 0.43578929999999999, 0.61685889999999999, 
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0.22395190000000001, 0.96622529999999995, 0.96981499999999998, 
0.87725109999999995, 0.27378429999999998, 0.40000849999999999, 
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1.3095889999999999, 1.7798430000000001, 1.579442, 1.2802979999999999, 
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1.5160979999999999, 1.158247, 1.881254, 1.502804, 1.9113869999999999, 
1.69492, 1.7977879999999999, 1.8425149999999999, 1.357745, 1.051261, 
1.4157420000000001, 1.389608, 1.287304, 1.8489800000000001, 1.8839969999999999, 
1.1861470000000001, 2.3183419999999999, 2.5326529999999998, 2.7909839999999999, 
2.370533, 2.2556959999999999, 2.1295329999999999, 2.2599960000000001, 
2.747309, 2.7346240000000002, 2.1122920000000001, 2.0203690000000001, 
2.1697069999999998, 2.954129, 2.6476470000000001, 2.1789160000000001, 
2.8742450000000002, 2.3920409999999999, 2.4462480000000002, 2.2417859999999998, 
2.7105980000000001, 2.0023710000000001, 2.6712699999999998, 2.3847139999999998, 
2.6325430000000001, 2.3576769999999998, 2.9468200000000002, 2.0459209999999999, 
2.8490679999999999, 2.7497379999999998, 2.6708789999999998, 2.4857860000000001, 
2.4243899999999998, 2.0963609999999999, 2.1336240000000002, 2.7165010000000001, 
2.8356029999999999, 2.1603029999999999, 2.9068860000000001, 2.1117159999999999, 
2.2066699999999999, 2.5265399999999998, 2.482691, 2.8224149999999999, 
2.5600930000000002, 2.9253040000000001, 2.6728779999999999, 2.1204170000000002, 
2.4810910000000002, 2.3230840000000001, 2.0415770000000002, 2.4262950000000001, 
2.5197039999999999, 2.4271880000000001, 2.7765049999999998, 2.178385, 
2.5151089999999998, 2.547593, 2.2805529999999998, 2.43865, 2.4811779999999999, 
2.2382949999999999, 2.348093, 2.51606, 2.3230379999999999, 2.1419739999999998, 
2.544883, 2.3503910000000001, 2.739099, 2.8411050000000002, 2.1592549999999999, 
2.80796, 2.737908, 2.7894320000000001, 2.3179620000000001, 2.014859, 
2.5613220000000001, 2.647999, 2.9478240000000002, 2.5669599999999999, 
2.5864600000000002, 2.0948560000000001, 2.9218820000000001, 2.2851330000000001, 
2.0132319999999999, 2.4767990000000002, 2.536168, 2.0370590000000002, 
2.2884479999999998, 2.0289510000000002, 2.3422130000000001, 2.2248929999999998, 
2.3203390000000002, 2.0678299999999998, 2.6428799999999999, 2.3140499999999999, 
2.677435, 2.6622750000000002, 2.7750210000000002, 2.8584969999999998, 
2.3406250000000002, 2.728567, 2.520095, 2.5742180000000001, 2.0290110000000001, 
2.2847490000000001, 2.3055599999999998, 2.6597580000000001, 2.3857200000000001, 
2.9754339999999999, 2.3076089999999998, 2.531209, 2.9908790000000001, 
2.625667, 2.1029870000000002, 2.9740540000000002, 2.4373999999999998, 
2.9058440000000001, 2.4522270000000002, 2.8425410000000002, 2.4090470000000002, 
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2.3594729999999999, 2.3232840000000001, 2.6172209999999998, 2.825704, 
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2.9730629999999998, 2.5273439999999998, 2.2642609999999999, 2.6643300000000001, 
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2.2098849999999999, 2.4937490000000002, 2.701476, 2.477706, 2.9657930000000001, 
2.249431, 2.5449660000000001, 2.376941, 2.2722899999999999, 2.05219, 
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2.2646579999999998, 2.5822590000000001, 2.2167919999999999, 2.3867620000000001, 
2.6604619999999999, 2.3127960000000001, 2.4223650000000001, 2.64445, 
2.391988, 2.1836720000000001, 2.3261189999999998, 2.6282369999999999, 
2.6965129999999999, 2.666112, 2.886504, 2.689057, 2.4650560000000001, 
2.6725029999999999, 2.2955939999999999, 2.6275689999999998, 2.137635, 
2.9299249999999999, 2.6025119999999999, 2.5036290000000001, 2.6956159999999998, 
2.468197, 2.6469179999999999, 2.400325, 2.079774, 2.6886109999999999, 
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2.6312679999999999, 2.282035, 2.4546209999999999, 2.230845, 2.2423700000000002, 
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2.6776909999999998, 2.5656409999999998, 2.1129410000000002, 2.9263189999999999, 
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