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balance mass
transp., polit.	contrepoids d'équilibrage

balance mass: 22 phrases in 14 subjects

Astronomy	1
Automated equipment	1
Aviation	1
Chemistry	1
Earth sciences	3
Environment	1
General	2
Immigration and citizenship	1
Measuring instruments	1
Natural resourses and wildlife conservation	1
Nuclear physics	1
Physical sciences	1
Transport	6
United Nations	1