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1.1 root 1: .PS
2: .ps 20
3: ## figure A-41
4: ## EXAMPLE: CONFIRMED SERVICE (cont.)
5: B1: box "USER"
6: arrow down from B1.s "\ .REQUEST" ljust
7: B2: box "PROVIDER" width 4*boxwid with .nw at (B1.sw.x, B1.sw.y-lineht)
8: B3: box "USER" with .se at (B2.ne.x, B2.ne.y+lineht)
9: line <- down from B3.s "\ .INDICATION" ljust
10: ##
11: B4: box "USER" with .n at (B1.s.x, B2.s.y-2*lineht)
12: line <- down from B4.s "\ .CONFIRMATION" ljust
13: B5: box "PROVIDER" width 4*boxwid with .nw at (B4.sw.x, B4.sw.y-lineht)
14: B6: box "USER" with .se at (B5.ne.x, B5.ne.y+lineht)
15: arrow down from B6.s "\ .RESPONSE" ljust
16: ##
17: line dashed from (B2.sw.x, B2.sw.y-lineht) \
18: to (B2.se.x, B2.se.y-lineht)
19: ##
20: .PE
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