For some reason the desmos engine doesn't do mod(x,3)=0, perhaps it's graphing an infinately small point. If you allow the value of the modular function to be less than a small number, say, mod(x,3)<0.01, then you will see the points you expect.
Verbatim is defined as an exact repetition without changing the words. An example of verbatim is when you quote someone exactly without changing anything. word for word; in exactly the same words. Origin of verbatim.
Example: Thoreau ends his essay with a metaphor: Time is but the stream I go a-fishing in.. This is an easy rule to remember: if you use a complete sentence to introduce a quotation, you need a colon after the sentence. Be careful not to confuse a colon (:) with a semicolon (;). Using a comma in this situation will most likely create a comma splice, one of the serious sentence-boundary errors.