Words that can be repeated and still make sense [duplicate]

Solution 1:

That that occurs sometimes. It sometimes means that which, and sometimes just that that, as in I know that that will not work.

Solution 2:

There's a whole bunch of words that function as more than one part of speech (albeit with different pronunciations). You can probably construct acceptable phrases from some of these. Here are 3 that come to mind:

• to record record profits
• to address address problems
• to refuse refuse charges

Solution 3:

One way this arises very simply and commonly is the repetition of adjectives and adverbs for emphasis:

We were going really, really fast!

I had a strange, strange dream last night.

On a different tack, there’s the interesting case of What it is, is…, discussed previously here and here.