ToExpression
 Usage
Notes
 Further Examples
Here is a way to determine the  most frequently used built-in (System`) functions in the standard add-on packages. This defines the function GetSymbols which gives a list of pairs {x, y} where x is a symbol name that appears in the text file and y is the number of times it appears.
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Here are the  most commonly used built-in functions along with how many times they are used in the packages.
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