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diff --git a/user_guide/images/nav_bg.jpg b/user_guide/images/nav_bg.jpg
deleted file mode 100644
index 3564070..0000000
--- a/user_guide/images/nav_bg.jpg
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diff --git a/user_guide/images/nav_separator.jpg b/user_guide/images/nav_separator.jpg
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index 3f8b151..0000000
--- a/user_guide/images/nav_separator.jpg
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diff --git a/user_guide/images/nav_toggle.jpg b/user_guide/images/nav_toggle.jpg
deleted file mode 100644
index 531bc26..0000000
--- a/user_guide/images/nav_toggle.jpg
+++ /dev/null
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