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-rw-r--r--usr.bin/learn/lib/eqn/L7.2b17
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diff --git a/usr.bin/learn/lib/eqn/L7.2b b/usr.bin/learn/lib/eqn/L7.2b
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+#print
+Does the input
+
+ sum from {i = -n} to {i = +n}
+
+produce the same output as the input
+
+ sum from i=-n to i=+n
+
+Answer yes or no.
+#copyin
+#user
+#uncopyin
+#match yes
+#log
+#next
+7.1c