壁碧璧逼迫北

壁bek8中入聲參考bik7音。逼bik7[audio:bek8.MP3]
逼bik7上入聲碧、璧、壁、愎、迫:參考baak7音。逼bik7迫baak7[audio:bik7.MP3]
北bak7上入聲北方。[audio:bak7.MP3]

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