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# I am not sure what mistake I am doing here.

Secondly, under what circumstances can I put defining variables outside a function. For e.g. can I put this outside the function? Thank you

```    vowel = ("a", "e", "i", "o", "u")
letters = list(word)
```
```def disemvowel(word):
vowel = ("a", "e", "i", "o", "u")
letters = list(word)

for letter in word:
if letter.lower in vowel:
letters.remove(letter)

return ",".join(letters)

new_word = disemvowel("australia")
print(new_word)
```
disemvowel.py
```def disemvowel(word):
vowel = ("a", "e", "i", "o", "u")
letters = list(word)

for letter in word:
if letter.lower in vowel:
letters.remove(letter)

return ",".join(letters)

new_word = disemvowel("australia")
print(new_word)
```

Sorry so late. Just went and read the challenge. They want you to return the word without vowels. You are returning the letters separated by commas. Guessing you've figured this out by now ;)

lower is a method on string, so it should be called like: `letter.lower()` You just left out the parens. Change that, and it should work.

Hi i just tried that but im still getting an error. Any suggestions?

```def disemvowel(word):
vowel = ("a", "e", "i", "o", "u")
letters = list(word)

for letter in word:
if letter.lower() in vowel:
letters.remove(letter)

return ",".join(letters)
```