Both of you are wrong. Read the question "carefully":

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You can use the following website and highlight your desired emoji > right click > copy >paste on the subject line of the intended thread.
https://emojipedia.org/

Take note: Not all of the emojis work. Also it will be shown differently on some of the browsers.

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I copied few of them on my personal text area (so you can see some).

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Update:
Haha,, good one