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+.PS
+# Ttree.m4
+# A binary tree using m4
+gen_init
+sinclude(tst.dim)
+s_init(Ttree)
+
+# `Node(no in row, head [location],
+# displacement of top of body (.n) wrt head,
+# body Node 1, body Node 2, ...) '
+define(`Node',`
+ Head`$1': `$2'
+ ifelse(`$3',,,`Body`$1': [
+ Loopover_(`v',`v; define(`m4ct',m4Lx)',shift(shift(shift($@))))
+ ] with .n at Head`$1' + `$3'
+ connect(`$1',m4ct)')')
+
+define(`connect',`Bot: move from Head$1.sw to Head$1.se
+for_(1,`$2',1,
+ `Top: move from Body$1.Head`'m4x.nw to Body$1.Head`'m4x.ne
+ Move: move from Head$1 to Body$1.Head`'m4x
+ if Bot.len*Top.len*Move.len > 0 then {
+ line from Intersect_(Move,Top) to Intersect_(Move,Bot)}')')
+
+ vsep = 0.75
+
+ Node(1,s_box($`h(h(h(x_1,x_2),h(x_3,x_4)),h(h(x_5,x_6),h(x_7,x_8)))'$),
+ (0,-vsep),
+ Node(1,s_box($`h(h(x_1,x_2),h(x_3,x_4))'$),
+ (0,-vsep),
+ Node(1,s_box($`h(x_1,x_2)'$),
+ (0,-vsep),
+ Node(1,s_box($`x_1:=((A,pk_A),h_1)'$)),
+ Node(2,s_box($`x_2:=((B,pk_B),h_2)'$) \
+ with .n at last "".ne+(0.2,-vsep*2/3))),
+ Node(2,s_box($`h(x_3,x_4)'$) with .nw at Head1.ne+(Body1.wid/2+0.1,0),
+ (0,-vsep),
+ Node(1,s_box($`x_3:=((A,pk_A^\prime),h_3)'$)),
+ Node(2,s_box($`x_4:=((D,pk_D),h_4)'$) \
+ with .n at last "".ne+(0.2,-vsep*2/3)))),
+ Node(2,s_box($`h(h(x_5,x_6),h(x_7,x_8))'$) \
+ with .nw at Head1.ne+(Body1.wid/2,0),
+ (0,-vsep),
+ Node(1,s_box($`h(x_5,x_6)'$),
+ (0,-vsep*5/4),
+ Node(1,s_box($`x_5:=((E,pk_E),h_5)'$)),
+ Node(2,s_box($`x_6:=((H,pk_H),h_6)'$) \
+ with .n at last "".ne+(0.2,-vsep*2/3))),
+ Node(2,s_box($`h(x_7,x_8)'$) with .nw at Head1.ne+(Body1.wid/2+0.1,0),
+ (0,-vsep*5/4),
+ Node(1,s_box($`x_7:=((D,pk_D^\prime),h_7)'$)),
+ Node(2,s_box($`x_8:=((K,pk_K),h_8)'$) \
+ with .n at last "".ne+(0.2,-vsep*2/3))),
+ Node(3,s_box($`h(x_9)'$) at 0.5 between Head1 and Head2)))
+
+.PE