id	keyword
ca-2109	air
ca-2109	suspension
ca-2109	atmospheric
ca-2109	university
ca-2109	wind
ca-2109	sand
ca-2109	medium
ca-2109	press
ca-2109	condition
ca-2109	new
ca-2109	things
ca-2109	attention
ca-2109	mushroom
ca-2109	anthropology
ca-2109	tunnel
ca-2109	earth