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freier Raum
gen.	unobstructed space; clear
construct.	free passage (profile, Profil)
econ.	vacancy
opt.	clearance
phys.	empty space; physical vacuum
voll.	free area around the court
freier raum
met.	free space

freier Raum: 15 phrases in 5 subjects

Communications	4
Electronics	6
Law	1
Optics branch of physics	3
Physics	1