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isPangram

Language/Type: JavaScript strings return
Author: Melissa Medsker-Galloway (on 2016/11/18)

Write a function named isPangram that accepts a string and returns true if the string is a pangram. A pangram is any phrase that contains at least one of each of the 26 letters in the English alphabet (ignoring letter-casing). For example, a call to isPangram("The quick brown fox jumps over a lazy dog.") should return true since it includes all 26 letters of the English alphabet (duplicate letters can be ignored).

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This is a function problem. Write a JavaScript function as described. Do not write a complete program; just the function(s) above.

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