11.   She spent a few hours a week in her luxurious congressional office behind an unmarked door.

a. + door >>共 690
closed 33.86%
locked 2.87%
wooden 2.56%
main 2.21%
metal 2.17%
new 1.73%
double 1.53%
french 1.47%
closet 1.25%
open 1.14%
unmarked 0.24%
unmarked + n. >>共 123
car 22.92%
grave 17.39%
police 11.86%
vehicle 2.96%
border 2.17%
door 2.17%
van 2.17%
box 1.38%
bus 1.38%
cruiser 1.38%
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