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The word com mean with. For example "He is 'with' his parents" would be "He is 'com' his parents.
What do you mean by 'COM'? COMMAND.COM, for example, isn't a programming language.
Assuming you hope to relay your email address you would say:
arroba yahoo punto com for the final part.
Example: example@yahoo.com would be:
example arroba yahoo punto com
.com is an example of an top-level domain
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