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Initial revision

.PS 4.5i
## figure A-24
B1a:	box invis
B1b:	box invis with .n at B1a.c
B1c:	box invis with .n at B1b.s
B1d:	box invis with .n at B1c.s
B1e:	box invis with .n at B1d.c
	line from B1a.nw to B1e.sw; line from B1a.ne to B1e.se
##
REQ:	box invis with .e at (B1b.nw.x-linewid, B1b.nw.y)
	move to REQ.e; \
	"\sf \begin{tabular}{l}  \ \ REQUEST\end{tabular}" rjust
	arrow from REQ.e to (B1b.nw.x-linewid/10, B1b.nw.y)
	arrow from B1b.nw to B1b.se dashed
IND:	box invis with .w at (B1b.se.x+linewid, B1b.se.y)
	move to IND.w; \
	"\sf \begin{tabular}{l}  \ \ INDICATION\end{tabular}" ljust
	arrow from (B1b.se.x+linewid/10, B1b.se.y) to IND.w
RSP:	box invis with .w at (B1d.ne.x+linewid, B1d.ne.y)
	move to RSP.w; \
	"\sf \begin{tabular}{l}  \ \ RESPONSE\end{tabular}" ljust
	arrow from RSP.w to (B1d.ne.x+linewid/10, B1d.ne.y)
	arrow from B1d.ne to B1d.sw dashed
CNF:	box invis with .e at (B1d.sw.x-linewid, B1d.sw.y)
	move to CNF.e; \
	"\sf \begin{tabular}{l}  \ \ CONFIRMATION\end{tabular}" rjust
	arrow from (B1d.sw.x-linewid/10, B1d.sw.y) to CNF.e
##
	arrow from (B1a.nw.x-linewid*4, B1a.nw.y) \
	      to   (B1e.sw.x-linewid*4, B1e.sw.y)
	move to (B1a.nw.x-linewid*4, (B1a.nw.y+B1e.sw.y)/2); "\ time" ljust
	box invis with .e at (IND.e.x+linewid, B1a.ne.y) ""
##
SP:	box invis with .s at B1a.n
	move to (B1a.nw.x, B1a.nw.y+lineht/4); "SAP"
	move to (B1a.ne.x, B1a.ne.y+lineht/4); "SAP"
	move to (REQ.c.x, SP.w.y); \
		"\begin{tabular}{c}  requesting\\ user\end{tabular}\ \ \ "
	move to (IND.c.x, SP.w.y); \
		"\ \ \ \begin{tabular}{c}  accepting\\ user\end{tabular}"
##
.PE

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