id	domain	url
gist-405	www.ice.upm.es	www.ice.upm.es/wps/jlbr/documentacion/libros/videdu.pdf
gist-405	www.academia.edu	https://www.academia.edu/1711441/vocabulary_
gist-405	apjee.usm.my	http://apjee.usm.my/apjee_24_2009/jpp24_10_