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+#print
+There are several warnings in order about mark and lineup.
+First, remember that you must use ".EQ I" or ".EQ L".
+Second, there can only be one mark or one lineup in any given
+equation.
+Finally, what you are doing must make sense, or
+your results may be not what you wanted.
+
+Does this sequence produce output with the equals signs
+lined up?
+ .EQ L
+ x mark = y
+ .EN
+ .EQ L
+ x+y mark = z
+ .EN
+Answer yes or no.
+#copyin
+#user
+#uncopyin
+#match no
+#log
+#next
+11.1a 10
+10.2c 5