h = .5; dh = .02; dw = .1
[
Ptr: [
boxht = h; boxwid = dw
A: box
B: box
C: box
box wid 2*boxwid "..."
D: box
]
Block: [
boxht = 2*dw; boxwid = 2*dw
movewid = 2*dh
A: box; move
B: box; move
C: box; move
box invis "..." wid 2*boxwid; move
D: box
] with .t at Ptr.s - (0,h/2)
arrow from Ptr.A to Block.A.nw + (dh,0)
arrow from Ptr.B to Block.B.nw + (dh,0)
arrow from Ptr.C to Block.C.nw + (dh,0)
arrow from Ptr.D to Block.D.nw + (dh,0)
]
box dashed ht last [].ht+dw wid last [].wid+dw at last []