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Initial revision
.PS
.ps 20
## figure 17
boxwid = 5 * boxwid
boxht = 2 * boxht
##
B1: box
B2: box shaded with .n at (B1.s.x, B1.s.y-lineht) \
"\normalsize PRESENTATION"
B3: box shaded with .n at (B2.s.x, B2.s.y-lineht) "\normalsize SESSION"
line from B1.s to B2.n "\ data structures" ljust
line from B2.s to B3.n "\ dialogues" ljust
##
boxwid = boxwid / 5
boxht = boxht / 2
B1a: box with .nw at (B1.nw.x+boxwid/2, B1.nw.y-boxht/2) "ACSE"
B1b: box with .n at (B1.n.x, B1.n.y-boxht/2) dashed "$\ldots$"
B1c: box with .ne at (B1.ne.x-boxwid/2, B1.ne.y-boxht/2) "ROSE"
##
.PE
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