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+#once #create message
+.ND
+.tr %$
+.EQ
+delim $$
+.EN
+.LP
+For practice, modify "Example" so it produces
+output that looks like this,
+then type "ready".
+.pl 1
+#once #create Ref
+.LP
+.EQ
+{ lim ~ "sup" } bar ~f(x) ~=~ x
+.EN
+.pl 1
+#once #create Example
+.LP
+.EQ
+xxx
+.EN
+.pl 1
+#
+#once neqn Ref | nroff >X1 &
+#once neqn message Ref | nroff -T$term %s/tinyms -
+#user
+neqn Example | nroff >X2
+#cmp X1 X2
+#log
+#next
+12.1a 10