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+.PS
+# Counting.m4
+gen_init
+
+ g = 0.4 # grid size
+ define grid { (($2)*g,-($1)*g) }
+ circlerad = 0.1
+
+for i=1 to 4 do {
+ sprintf(`"$S_%g$:"',i) ljust at grid(i,-0.5)
+ for j=1 to 4 do { if i+j < 8 then {
+ sprintf(`"$s_{%g%g}$"',i,j) at grid(i,j) } } }
+
+"$\vdots$" at grid(4.75,0)
+for i=1 to 3 do { `"$\cdots$"' at grid(i,5) }
+"$\cdots$" at grid(4,4)
+
+P: grid(1,1)
+for k=3 to 5 do {
+ for i=1 to k-1 do { if (k%2==1) then { m=i; n=k-i } else { m=k-i; n=i }
+ Q: grid(m,n)
+ arrow from P to Q chop
+ P: Q }
+ }
+
+.PE