html - Selecting every third element except for a few (in unordered list) -

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How can I select every other 3 elements in an unordered list like below? I have & lt; Li & gt; There is a random amount of but I need the third, ninth, fifteen, etc. for example every second 3. Is this possible in HTML or CSS or javascript?

& lt; Ul & gt; & Lt; Li & gt; & Lt; / Li & gt; & Lt; Li & gt; & Lt; / Li & gt; & Lt; Li & gt; & Lt; / Li & gt; & Lt; Li & gt; & Lt; / Li & gt; ... & lt; / Ul & gt;

You actually want to select each sixth element Looking for, but starting with the third: 

  ul li: nth-child (6n + 3)

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