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1.1 root 1: .PS
2: .ps 20
3: ## figure 3
4: B1: box "O"
5: B2: box "S" with .n at (B1.s.x, B1.s.y-lineht)
6: line from B1.s to B2.n
7: B3: box "F" with .w at (B2.e.x+2*linewid, B2.e.y)
8: line from B2.e to B3.w
9: B4: box "D" with .w at (B3.e.x+2*linewid, B3.e.y)
10: line from B3.e to B4.w
11: B5: box "R" with .s at (B4.n.x, B4.n.y+lineht)
12: line from B4.n to B5.s
13: line dashed from B1.e to B5.w "end-to-end" ""
14: line dashed from (B2.e.x, B2.s.y-lineht/2) \
15: to (B4.w.x, B4.s.y-lineht/2)
16: move to (B3.s.x, B4.s.y-(lineht/2+boxht/4)); \
17: "store-and-forward" center
18: ##
19: .PE
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