org: no-expand

 
 14.8.2.11 ‘:no-expand’
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 By default, code blocks are expanded with ‘org-babel-expand-src-block’
 during tangling.  This has the effect of assigning values to variables
 specified with ‘:var’ (see Seevar), and of replacing “noweb”
 references (see SeeNoweb reference syntax) with their targets.  The
 ‘:no-expand’ header argument can be used to turn off this behavior.