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1.1 ! root 1: .PS ! 2: .ps 20 ! 3: ## figure 3 ! 4: B1: box shaded ! 5: B2: box invis with .s at (B1.n.x, B1.n.y+lineht) "$\hbox{O}_1$" ! 6: B3: box invis with .n at (B1.s.x, B1.s.y-lineht) "$\hbox{I}_1$" ! 7: arrow from B1.n to B2.s ! 8: arrow from B3.n to B1.s ! 9: arrow from B1.w to (B1.w.x-linewid, B1.w.y) ! 10: move to (B1.w.x, B1.w.y+boxht/3); "$\hbox{P}_1$ " rjust ! 11: ## ! 12: B4: box shaded with .w at (B1.e.x+4*linewid, B1.e.y) ! 13: B5: box invis with .s at (B4.n.x, B4.n.y+lineht) "$\hbox{O}_2$" ! 14: B6: box invis with .n at (B4.s.x, B4.s.y-lineht) "$\hbox{I}_2$" ! 15: arrow from B4.n to B5.s ! 16: arrow from B6.n to B4.s ! 17: arrow from B4.e to (B4.e.x+linewid, B4.e.y) ! 18: move to (B4.e.x, B4.e.y+boxht/3); " $\hbox{P}_2$" ljust ! 19: ## ! 20: .PE
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