id	keyword
cet-14351	rail
cet-14351	transport
cet-14351	travel
cet-14351	sustainability
cet-14351	trains
cet-14351	night
cet-14351	speed
cet-14351	study
cet-14351	environmental
cet-14351	italy
cet-14351	destination
cet-14351	air
cet-14351	time