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Yep, there's a StringBuilder constructor which takes a string.

If you're unsure about whether something is possible or not, there are 2 good courses of action:

1. Try it
2. Look at the Javadoc...

Remove it from your original string. This is much easier to do with a StringBuilder because it is mutable where Strings are not.

// removing a letter from a StringBuilder
StringBuilder b = new...

that's kind of difficult since strings are basically just character arrays...

but none the less, what you could do is create a new string result, then randomly remove a letter from the original...