Pangram checker

You are encouraged to solve this task according to the task description, using any language you may know.
A pangram is a sentence that contains all the letters of the English alphabet at least once.

For example:   The quick brown fox jumps over the lazy dog.



Task

Write a function or method to check a sentence to see if it is a   pangram   (or not)   and show its use.



Related tasks

   determine if a string has all the same characters
   determine if a string has all unique characters


shared void run() {
 
	function pangram(String sentence) =>
 		let(alphabet = set('a'..'z'),
			letters = set(sentence.lowercased.filter(alphabet.contains)))
 		letters == alphabet;
 
 	value sentences = [
 		"The quick brown fox jumps over the lazy dog",
 		"""Watch "Jeopardy!", Alex Trebek's fun TV quiz game.""",
 		"Pack my box with five dozen liquor jugs.",
 		"blah blah blah"
 	];
 	for(sentence in sentences) {
 		print("\"``sentence``\" is a pangram? ``pangram(sentence)``");
 	}
}