id	domain	url
stem-2505	plato.stanford.edu	https://plato.stanford.edu/entries/nothingness
stem-2505	en.wikipedia.org	https://en.wikipedia.org/wiki/nothing#cite_ref-18
stem-2505	plato.stanford.edu	https://plato.stanford.edu/entries/nothingness
stem-2505	en.wikipedia.org	https://en.wikipedia.org/wiki/nothing#cite_ref-18