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diff --git a/doc/guides/prog_guide/img/ring-enqueue1.svg b/doc/guides/prog_guide/img/ring-enqueue1.svg
new file mode 100644
index 00000000..e7030ebf
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+++ b/doc/guides/prog_guide/img/ring-enqueue1.svg
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+# - Redistributions of source code must retain the above copyright
+#   notice, this list of conditions and the following disclaimer.
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+#   notice, this list of conditions and the following disclaimer in
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