我到理发店理发，一个店里有六个理发员，就有三个以上的讨论特码问题。
B-Person O B-Location I-Location I-Location O B-Thing O B-Metric I-Metric B-Location I-Location O B-Metric I-Metric B-Person I-Person I-Person O O O B-Metric I-Metric O O O O O B-Thing I-Thing I-Thing I-Thing O