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diff --git a/usr.bin/learn/lib/eqn/L6.1b b/usr.bin/learn/lib/eqn/L6.1b
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+#print
+There is one other thing you have to do before
+you can use a character as a delimiter - you
+have to tell neqn that you are going to.
+To do this, as the very first thing in your
+input you must put these three lines:
+
+.EQ
+delim $$
+.EN
+
+(If you like, other characters than $ can be used,
+but we will stick to dollar signs here.)
+Until you do this, $ signs have no special
+significance to neqn.
+
+Modify the file "Example" by adding the "delim"
+lines to the beginning, and check that $ signs are
+now significant.  Type "ready" when you are done.
+#once #create Ref
+.EQ
+delim $$
+.EN
+.LP
+Now is the $times$ for all good $mu$ $epsilon$ $nu$
+to come to the aid of their party.
+.pl 1
+#once #create Example
+.LP
+Now is the $times$ for all good $mu$ $epsilon$ $nu$
+to come to the aid of their party.
+.pl 1
+#user
+#cmp Ref example
+#log
+#next
+6.1c 10