21.   That would leave only the British Open and PGA Championship to complete an unprecedented Grand Slam sweep.

a. + sweep >>共 384
clean 11.81%
republican 3.69%
first 3.14%
austrian 2.58%
military 2.03%
unprecedented 1.94%
second 1.75%
broad 1.75%
russian 1.57%
grand 1.38%
unprecedented + n. >>共 951
number 2.87%
level 2.77%
move 2.44%
step 2.22%
security 2.09%
meeting 1.38%
summit 1.27%
wave 1.22%
visit 1.19%
access 1.14%
sweep 0.57%
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