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<?php $letters=array("A","C","M","E"); echo "Today's challenge is brought to you by the "; echo count()$letters; echo " letters: "; echo "AC"; echo "."; ?>
$letters is your array.
count() is a function that returns the number of items in an array. This function needs to have an argument inside the parentheses so it knows what to count. Example:
count($letters). Notice here that you don't want to add square brackets at the end of the array.
Does this help you figure the rest out?