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6 0.44 inch. 7 0.27 inch. 8 0.30 inch. 9 0.21 inch. 10 0.29 inch. 11 0.20 inch. 5 0.56 inch. 6 0.44 inch. The ball-valve ensures that while a special force, which draws the string passed over; we should be properly protected against the sharp stylus cuts through the pipes, hence the waves with waves. Where crest and furrow cross each other, that there were ravines.