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Added text requested by local organizers.

_pages/participants/invitation_letters.md

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-A letter of invitation will be issued once you register for the EMNLP 23 Conference through YesEvents and can be printed for your travel. 
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-Participants from some Countries will need an additional Visa [V39A form](https://drive.google.com/file/d/101n0IyxzeS53HbcElWBqwbprS45MMH3Z/view). The ACL has designated CMA International Consultants to assist in the issuance of V39A form to support visa application. If you need assistance in getting your V39A letter, click [here](https://forms.gle/gwAP1Rhj5kejr7vY8).
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-website - [https://www.cma.sg/](https://www.cma.sg/)
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-Phone - +65 6336 2328
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-Contacts: 
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-Ee Lim - [email protected]
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-Allison Law - [email protected]
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+We are pleased to announce that we have created a [form](https://forms.office.com/r/rwq33DTqhL) for conference attendees to request an invitation letter for a visa. If you need an invitation letter to apply for a visa, go to the form and follow the instructions. Note that this form is only for those submitting papers to the main conference tracks, as well as invited speakers for and members of the organizing committees for the main conference and co-located workshops. If you are only submitting a paper to a workshop, please reach out to your workshop organizers for an invitation letter. If you have any questions, please don't hesitate to reach out to the local arrangements chairs [Mark Finlayson](mailto:[email protected]) and [Zoey Liu](mailto:[email protected]).