15. [40] Complete the function is_anagram that takes a string and returns True if it's an anagram and False otherwise. An angram a word w is simply a permutation of the letters. You can assume the string is either empty or composed only of lowercase letters. For example, bat and tab are anagrams; however, butt and tub are not. You cannot use any built-in Python functions. 1 def is_anagram(xstring, ystring): 2 3 4 words[["bat", "tab"], ["butt", "tub"].["evilrats", "livestar"].[" 123",- #TO DO: Implement Function "112233" 5 6 7 #for win words: # print(is-anagram(W[0],wf1])) True False True False