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четырёхлетний период stresses
book.	quadrennium; quadriennium
Makarov.	quadrennial period
obs.	quadrennial
relig.	quadrennial (Consisting of or lasting for four years); quadrennium (A period of four years)

четырёхлетний период: 4 phrases in 3 subjects

Diplomacy	1
General	2
United Nations	1