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I am sorry to hear about this situation. The first thing that someone in your situation wants to do is to contact your company's HR and tell them about what happened. If there is established policies and procedures for sexual harassment complaints, the company will follow them which can mean the person being demoted, fired, suspended, etc.
You can call the police if you want to, and this would then become a criminal matter, as well. This is an assault, and the police may open up a case against the person along with the company pursuing its own investigation into the matter.
Note that it is illegal for an employer retaliate against an employee (i.e. you) if you complaint about something that you reasonable deemed to be sexual harassment.
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