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on the principles of stresses
product.	на принципах (Yeldar Azanbayev)
on the principle of
math.	по принципу
scient.	на ... (часто можно опустить "the principle of", оставив только "на ...": echo sounder works on the principle of ... – ... на измерении времени прохождения звука... multitran.com MichaelBurov)

on the principles of: 43 phrases in 10 subjects

Astronautics	2
Diplomacy	3
Economy	1
General	9
Law	9
Makarov	8
Military	2
Name of organization	3
Programming	3
United Nations	3