A particle moves along the x-axis so that its position at time 0 < t < 18 is given by x(t), whose graph is shown in the figure below. The inflection points of the graph are marked with green circles. Find all intervals of time when the speed of the particle is increasing. y 8 7 6 5 4 3 -2 -1 2 1 -1 -2 -3 -4 -5 -7 -8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

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