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This returns a new data parameter that contains the vowels in the $a parameter.


In normal usage, the $a parameter will be an explode parameter


$a = explode("RATATOUILLE")  


this is equivalent to defining $a as


$a = data("R","A","T","A","T","O","U","I","L","L","E")


{vowel($a)} will return "A, A, O, U, I, E"


The vowel command will often be combined with unique or sort
The vowel command understands English and Greek vowels
y is not treated as a vowel OR consonant with this command.