Continuous curve, labeled f of x, coming from upper left, passing through the x axis at point labeled, a, turning in third quadrant, passing through a point labeled, b, changing from concave up to concave down in second quadrant, then passing through point in quadrant 2 labeled, c, turning down at the y axis, passing through a point in quadrant 1 labeled, d, changing from concave down to concave up at the x axis, passing through a point in quadrant 4 labeled, e, continuing right & down.
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