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in threes stresses
gen.	по три; по три (в каждом); по трое; тройками
in three
Gruzovik	натрое
math.	втрое

in threes: 375 phrases in 55 subjects

Accounting	1
Aerohydrodynamics	2
Antennas and waveguides	1
Apollo-Soyuz	1
Architecture	1
Automated equipment	1
Aviation	1
Aviation medicine	1
Bible	1
Biology	1
Business	3
Chess	13
Christianity	3
Computer graphics	2
Construction	1
Diplomacy	4
Drives	2
Economy	3
Electrical engineering	1
Emphatic	1
Energy system	9
Figurative	1
Figure of speech	2
Finances	1
General	119
Historical	2
Idiomatic	1
Informal	1
Law	3
Literature	8
Makarov	114
Mathematics	10
Mechanics	1
Medical	1
Military	2
Mining	1
Nanotechnology	6
Nautical	2
Nuclear physics	1
Oil / petroleum	1
Oil and gas	1
Oilfields	1
Perfume	4
Programming	8
Proverb	7
Quotes and aphorisms	1
Radiolocation	1
Religion	1
Saying	7
Scientific	2
Securities	3
Slang	2
Sports	3
Technology	3
Tennis	1