id	keyword
brj-23441	hardness
brj-23441	surface
brj-23441	wood
brj-23441	values
brj-23441	nahco3
brj-23441	material
brj-23441	month
brj-23441	test
brj-23441	factors
brj-23441	samples
brj-23441	aging
brj-23441	abrasion
brj-23441	fig