id	keyword
cet-2950	production
cet-2950	hydrogen
cet-2950	coffee
cet-2950	mucilage
cet-2950	waste
cet-2950	cocoa
cet-2950	fermentation
cet-2950	energy
cet-2950	pig
cet-2950	manure
cet-2950	process
cet-2950	biomass