* The Toronto Stock Exchange's S&P/TSX fell 131.48 points, or 0.81 percent, to 16,073.14. * Leading the index were BlackBerry Ltd, up 10.2 percent, Paramount Resources Ltd, up 7.6 percent, and Aurora Cannabis Inc, higher by 6.3 percent. * Lagging shares were West Fraser Timber Co Ltd, down 6.4 percent, Norbord Inc, down 4.9 percent, and First Quantum Minerals Ltd, lower by 4.9 percent. * For the week, the index lost 0.93 percent. * On the TSX 100 issues rose and 139