id	keyword
alkej-1001	air
alkej-1001	temperature
alkej-1001	heat
alkej-1001	soil
alkej-1001	eahe
alkej-1001	pipe
alkej-1001	system
alkej-1001	january
alkej-1001	june
alkej-1001	energy
alkej-1001	engineering
alkej-1001	journal
alkej-1001	earth
alkej-1001	cooling
alkej-1001	variation
alkej-1001	winter