id	keyword
bracis-28374	clustering
bracis-28374	trajectories
bracis-28374	trajectory
bracis-28374	aspect
bracis-28374	tree
bracis-28374	mat
bracis-28374	google
bracis-28374	scholar
bracis-28374	data
bracis-28374	method
bracis-28374	semantic
bracis-28374	article
bracis-28374	clusters
bracis-28374	frequency