id	keyword
cet-9104	purification
cet-9104	method
cet-9104	fume
cet-9104	oil
cet-9104	technology
cet-9104	cooking
cet-9104	purification method
cet-9104	kitchen
cet-9104	combustion
cet-9104	fume purification
cet-9104	washing