https://twitter.com/search-advanced
has the following options

 1. Any of the words
 2. All of the words
 3. Exact Phrase

But the user could make a mistake and enter values for all of them, why didn't they use a radio button across these options.

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For reference, this is what twitter's advanced search currently looks like:
![enter image description here][1]


  [1]: http://i.stack.imgur.com/2jnFw.png