id	keyword
american_scientific_journal-1432	lpg
american_scientific_journal-1432	use
american_scientific_journal-1432	cooking
american_scientific_journal-1432	energy
american_scientific_journal-1432	respondents
american_scientific_journal-1432	household
american_scientific_journal-1432	gas
american_scientific_journal-1432	level
american_scientific_journal-1432	study
american_scientific_journal-1432	area
american_scientific_journal-1432	journal