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salaoja form.
agric., construct.	drain; drainage channel; blind drain
construct.	cut-off drain
mech.eng., construct.	buried drain; drain pipe; drain tile; field drain; field drain pipe; land pipe; lateral drain; subsoil pipe; subsurface drain; underdrain
mun.plan., environ.	covered drain

salaoja: 4 phrases in 3 subjects

Agriculture	1
Construction	1
Mechanic engineering	2