a. + oil >>共 628
heating 7.65%
iraqi 5.23%
major 3.13%
cooking 2.92%
foreign 2.81%
state 2.53%
higher 2.19%
international 2.12%
russian 2.10%
offshore 1.56%
heating + n. >>共 141
oil 47.51%
system 11.28%
fuel 8.03%
bill 4.98%
season 2.08%
element 2.03%
cost 1.98%
demand 1.68%
plant 1.58%
unit 1.22%
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