import BTL learn(1) lessons/eqn

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diff --git a/usr.bin/learn/lib/eqn/L3.1b b/usr.bin/learn/lib/eqn/L3.1b
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+#once #create message
+.ND
+.PP
+Naturally there is a superscript operation that's exactly
+like "sub", except that it goes up instead of down.
+It is called "sup".  To make
+.EQ
+x sup i+j
+.EN
+for example, you type
+   .EQ
+   x sup i+j
+   .EN
+
+Make the file "Example" produce the same output
+as the following, then type "ready".
+#once #create Ref
+.LP
+.EQ
+x sup alpha ~=~ y sup pi ~+~ z sup pi
+.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
+#fail
+Don't forget that there are spaces
+around the = and +.
+#cmp X1 X2
+#log
+#next
+3.1c 10