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An anagram is the result of rearranging the letters of a word to form a new
word, using all the original letters exactly once; for example, the word anagram
can be rearranged into nagaram.

Using PHP, JavaScript or any language of your choice, implement a function
“is_anagram” that takes two words, and returns true if the second word is an
anagram of the first, and false if not.

is_anagram(hello, hlleo) = true
is_anagram(test, tast) = false
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