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1.1 root 1: .PS 7.0i
2: .ps 20
3: ## figure 17
4: B1: box "TCP" "" "only"
5: line up from B1.n
6: box invis "$\cdots$" with .w at B1.e
7: B2: box with .w at (B1.e.x+boxwid, B1.e.y) "OSI" "" "only"
8: line up from B2.n
9: box invis "$\cdots$" with .w at B2.e
10: B3: box with .w at (B2.e.x+boxwid, B2.e.y) "OSI-UL" "" "TCP"
11: line up from B3.n
12: B4: box with .sw at (B1.ne.x, B1.ne.y+lineht*2) "TSB" "" "A-GWYs"
13: line down from B4.s
14: box invis "LOCAL USE" with .s at B4.n
15: B5: box with .w at (B4.e.x+boxwid, B4.e.y) "TSB" "" "A-GWYs"
16: line down from B5.s
17: line up dashed from B5.n
18: box invis with .s at (B5.n.x, B5.n.y+lineht) "X.25" "" "WAN"
19: B6: box with .w at (B5.e.x+boxwid, B5.e.y) "TSB" "" "A-GWYs"
20: line down from B6.s
21: line up dashed from B6.n
22: box invis with .s at (B6.n.x, B6.n.y+lineht) "IP" "" "WAN"
23: ##
24: line from (B1.w.x-linewid/2, B1.n.y+lineht) \
25: to (B6.e.x+linewid/2, B6.s.y-lineht)
26: move to (B6.e.x+linewid/2, B6.s.y-lineht); "\ LAN" ljust
27: ##
28: ##
29: .PE
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