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.
what he said made a deep impression on..: hoc verbum alte descendit in pectus alicuius. to agree in fact but not in word: re concinere, verbis discrepare. to address a meeting of the people: verba facere apud populum, in contione. pathos; passion: magniloquentia, granditas verborum.