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if numpy.array_equal( u1, u2 ) or numpy.array_equal( u1, -u2 ): #then
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# > t, p1_x, p1_y, p1_z, p2_x, p2_y, p2_z, u1_x, u1_y, u1_z = symbols('t, p1_x, p1_y, p1_z, p2_x, p2_y, p2_z, u1_x, u1_y, u1_z')
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# > d_sqrd = (p1_x + u1_x*t - p2_x)**2 + (p1_y + u1_y*t - p2_y)**2 + (p1_z + u1_z*t - p2_z)**2