Audacity Keyboard Shortcut for Inserting Silence

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http://askubuntu.com – I have many audio files and I have to insert many silences into the files. I can click on the Generate > Silence manually but thats takes too much time. I was wondering if there is anyway I can assign a keyboard shortcut for this action. I already checked preference but could not add it. I would really appreciate your help, (HowTos)