Schafer-Nielsen Drinker method

Schaffer schadenfreude Schaefer Schafer schaaf schaap schaapsteker Schacher's ganglia Schacher's ganglion Schachowa's spiral tubes Schachowa's tube Schacht

system of democratic centralism system of direct election system of economic management system of exploitation system of export licensing system of fits system of forces system of government system of internal check system of international law