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BSD 4.3reno

.PS
.ps 20
boxwid	=	3*boxwid
define boxit @
	box "$1" with .n at ($2.s.x, $2.s.y-lineht/2)
	line from $2.s to last box.n
@
## figure 2a
B1:	box "APPLICATION"
B2:	boxit(PRESENTATION,B1)
B3:	boxit(SESSION,B2)
B5:	box with .nw at (B1.ne.x+linewid, B1.ne.y) height B1.ne.y-B3.se.y \
		width boxht/6 shaded
	move to B5.e; "\ PURE ISO" ljust
B4:	box "ISO TRANSPORT" "" "SERVICE IN A" "" "non-ISO NETWORK" \
		with .n at (B3.s.x, B3.s.y-lineht/2) height 3*boxht
	line from B3.s to B4.n
##
.PE

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