id	keyword
ajst-21789	gas
ajst-21789	prediction
ajst-21789	model
ajst-21789	principal
ajst-21789	emission
ajst-21789	ipca
ajst-21789	component
ajst-21789	gas emission
ajst-21789	pso
ajst-21789	particle
ajst-21789	analysis
ajst-21789	coal