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+.PS
+# `Wheat.m4'
+gen_init
+
+boxwid = boxht
+
+for j = 0 to 7 do {
+ for i = 0 to 7 do {
+ box fill_((i+j)%2) at (j*boxwid,-i*boxwid)
+ x = 2^(j+8*i)
+ if (i+j)%2==0 then { command "{\white" } else { command "{\black" }
+ if x < 10000 then { sprintf("\Large$%g$",x) at last box } \
+ else { y = int(log(x))
+ sprintf("{\Large$%g$}$\cdot 10^{%g}$",round_(x/(10^y)),y) \
+ at last box }
+ command "}"
+ }
+ }
+
+.PE