id	keyword
cpos-333	migration
cpos-333	london
cpos-333	ravenstein
cpos-333	population
cpos-333	net
cpos-333	wse
cpos-333	ttwas
cpos-333	absorption
cpos-333	change
cpos-333	oma
cpos-333	rate
cpos-333	rings
cpos-333	deconcentration
cpos-333	infl
cpos-333	transfer
cpos-333	place