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diff --git a/_config/fontconfig/conf.d/50-user.conf b/_config/fontconfig/conf.d/50-user.conf
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+<?xml version="1.0"?>
+<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
+<fontconfig>
+
+<!--
+User-wide font configurations
+
+Configuration file ordering (prefix & description):
+50 : User overrides
+51 : Local system overrides
+55-59 : High priority LGC (latin greek cyrillic) fonts
+        (distribution general-purpose default fonts)
+60 : Main LGC font list
+61-64 : Low priority LGC fonts
+65-69 : Fonts with less common encodings, ending with fonts that
+        provide coverage of exotic unicode blocks at the expense of
+        drawing quality.
+
+References:
+[1] https://freedesktop.org/software/fontconfig/fontconfig-user.html
+    See also `fonts.conf(5)'
+[2] https://fedoraproject.org/wiki/Fontconfig_packaging_tips
+[3] https://wiki.archlinux.org/index.php/font_configuration
+[4] https://wiki.gentoo.org/wiki/Fontconfig
+[5] https://eev.ee/blog/2015/05/20/i-stared-into-the-fontconfig-and-the-fontconfig-stared-back-at-me/
+
+
+Aaron LI
+Created: 2014-04-06
+-->
+
+  <!--
+      Set correct common families for custom "serif" and "monospace" fonts,
+      otherwise fontconfig assumes any /unrecognized/ font is "sans-serif",
+      thus cause *wrong fallback* fonts being found.
+  -->
+  <!-- "serif" faces -->
+  <alias>
+    <family>Source Serif Pro</family>
+    <default><family>serif</family></default>
+  </alias>
+  <!-- "monospace" faces -->
+  <alias>
+    <family>Source Code Pro</family>
+    <default><family>monospace</family></default>
+  </alias>
+  <alias>
+    <family>Fira Code</family>
+    <default><family>monospace</family></default>
+  </alias>
+
+  <!-- Font families preferences -->
+  <!--
+      <alias> elements provide a shorthand notation for the set of common
+      match operations needed to substitute one font family for another.
+      They contain a <family> element followed by optional <prefer>,
+      <accept> and <default> elements.
+  -->
+  <!-- "serif" font family -->
+  <alias>
+    <family>serif</family>
+    <prefer>
+      <family>Source Serif Pro</family>
+      <family>Noto Serif</family>
+    </prefer>
+  </alias>
+  <!-- "sans-serif" font family -->
+  <alias>
+    <family>sans-serif</family>
+    <prefer>
+      <family>Source Sans Pro</family>
+      <family>Noto Sans</family>
+      <!-- Also ordering the Noto CJK fonts for "zh-cn"-->
+      <family>Noto Sans CJK SC</family>
+      <family>Noto Sans CJK TC</family>
+      <family>Noto Sans CJK JP</family>
+      <family>Noto Sans CJK KR</family>
+    </prefer>
+  </alias>
+  <!-- "monospace" font family -->
+  <alias>
+    <family>monospace</family>
+    <prefer>
+      <family>Source Code Pro</family>
+      <family>Fira Code</family>
+      <family>Noto Mono</family>
+      <!-- Also ordering the Noto CJK fonts for "zh-cn"-->
+      <family>Noto Sans Mono CJK SC</family>
+      <family>Noto Sans Mono CJK TC</family>
+      <family>Noto Sans Mono CJK JP</family>
+      <family>Noto Sans Mono CJK KR</family>
+    </prefer>
+  </alias>
+
+  <!-- Substitute Helvetica and Arial -->
+  <match>
+    <test name="family">
+      <string>Helvetica</string>
+    </test>
+    <edit binding="same" mode="assign" name="family">
+      <string>Source Sans Pro</string>
+    </edit>
+  </match>
+  <match>
+    <test name="family">
+      <string>Arial</string>
+    </test>
+    <edit binding="same" mode="assign" name="family">
+      <string>Source Sans Pro</string>
+    </edit>
+  </match>
+</fontconfig>