Word:
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OIF
OIG
OII
OIIC
Oil
Oil bag
oil beetle
Oil box
oil burner
oil business
oil cake
oil cartel
oil change
Oil cock
oil color
oil company
-- oil conservation --
Oil cup
Oil engine
oil filter
oil furnace
oil future
Oil gas
oil geologist
oil gland
Oil green
oil heater
oil industry
oil lamp
oil meal
oil nut
Oil of birch
Oil of bitter almonds
oil conservation
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Noun
1.
oil conservation
-
the
conservation
of
petroleum
resources
conservation
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