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постучать в дверь stresses
gen.	rap at the door; tap at the door; knock on the door; knock at the door
amer.	rap on the door (Val_Ships)
Makarov.	rap at a door; give a knock; give a knock on the door
постучаться в дверь
Makarov.	give a knock on the door; knock at the door

постучать в дверь: 27 phrases in 3 subjects

British usage, not spelling	2
General	19
Makarov	6