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.PS
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## figure A-41
## EXAMPLE: CONFIRMED SERVICE (cont.)
B1:	box "USER"
	arrow down from B1.s "\ .REQUEST" ljust
B2:	box "PROVIDER" width 4*boxwid with .nw at (B1.sw.x, B1.sw.y-lineht)
B3:	box "USER" with .se at (B2.ne.x, B2.ne.y+lineht)
	line <- down from B3.s "\ .INDICATION" ljust
##
B4:	box "USER" with .n at (B1.s.x, B2.s.y-2*lineht)
	line <- down from B4.s "\ .CONFIRMATION" ljust
B5:	box "PROVIDER" width 4*boxwid with .nw at (B4.sw.x, B4.sw.y-lineht)
B6:	box "USER" with .se at (B5.ne.x, B5.ne.y+lineht)
	arrow down from B6.s "\ .RESPONSE" ljust
##
	line dashed from (B2.sw.x, B2.sw.y-lineht) \
		    to   (B2.se.x, B2.se.y-lineht)
##
.PE

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