id	keyword
ajst-29856	roadway
ajst-29856	rock
ajst-29856	filling
ajst-29856	working
ajst-29856	coal
ajst-29856	face
ajst-29856	support
ajst-29856	working face
ajst-29856	roof
ajst-29856	undercover
ajst-29856	figure
ajst-29856	strength