(b) Specify the orientation of feed lines in the x-y plots for the following q values: (i) q＞1, (ii) q=1, (iii) 0＜ q ＜ 1, (iv) q=0, and (v) q ＜ 0, where q is the moles of liquid flow in the stripping section for each mole of feed. (10 分)