id	keyword
ap-4175	chimney
ap-4175	chimney reservoirs
ap-4175	water
ap-4175	tank
ap-4175	czech
ap-4175	concrete
ap-4175	pipe
ap-4175	republic
ap-4175	structure
ap-4175	steel
ap-4175	figure
ap-4175	shaft
ap-4175	prague
ap-4175	factory