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How to disambiguate 'true variables' from 'false variables'?

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# A variable that should have some 'default' fill in value if the user
+-supplied value is left blank
# A sample code-snippet that should appear inside the HTML and not be 
+messed with or interpolated AT ALL

Hello @@@:username:@@@, 
Please consider using @@@:existing_template_system:@@@ 
...
of hand-rolling the @@@:huge_number:@@@th ad-hoc system
that no one understands except you.