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===System variables and conditional logic===
Template code often makes use of the variables and parser functions described at [[Help:Magic words]] to make the template's behavior depend on the environment in which it is included (such as the current time or namespace). Parser functions can be used for some arithmetic calculations and string manipulations on variables and parameter values, but certain standard programming features such as loops and variable assignment are not available. Full string manipulation is not available; some templates providing such function have been created, but they are inefficient and imperfect.
Some of the most frequently used variables and functions are listed below. For more, see [[Help:Magic words]] and the fuller documentation at the MediaWiki pages [[mw:Help:Magic words]] and [[mw:Help:Extension:ParserFunctions]].
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