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+############################################################################
+#
+# File: chars.icn
+#
+# Subject: Program to list the different characters in a file
+#
+# Author: Ralph E. Griswold
+#
+# Date: March 26, 2002
+#
+############################################################################
+#
+# This file is in the public domain.
+#
+############################################################################
+#
+# This program lists all the different characters in a file. image()
+# is used to show printable representations.
+#
+############################################################################
+
+procedure main()
+ local chars
+
+ chars := ''
+
+ while chars ++:= read()
+
+ every write(image(!chars))
+
+end