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запасной маршрут stresses
avia.	reserved route
Gruzovik, mil.	alternative routing
mil.	reserve route; alternative route
tech.	alternate route (полёта)
transp.	alternate route
запасный маршрут
Gruzovik	alternative routing
mil., arm.veh.	alternate routing
mil., tech.	alternative route

запасной маршрут: 9 phrases in 3 subjects

Aviation	6
Military	2
Road works	1