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Rewrite the example in The $macrocall widget can take variables as parameters to call a macro animalLinkText to get the value of the linkText parameter to the wikipediaLink macro. In other words, replace the <<linktext>> variable that's currently there with a macro.
The animalLinkText macro should take a letter as a parameter and output the text An animal which begins with {LETTER}, where {LETTER} is the parameter passed. Update the example to display the appropriate link text for each of the three animals.