id	keyword
ar-22391	marx
ar-22391	labor
ar-22391	working
ar-22391	army
ar-22391	class
ar-22391	precariousness
ar-22391	reserve
ar-22391	workers
ar-22391	reserve army
ar-22391	new
ar-22391	population
ar-22391	capital
ar-22391	employment
ar-22391	industry
ar-22391	conditions
ar-22391	theory