A complete domain name is valid if it meets the following criteria:
* A complete domain name must have one or more subdomain names and one top-level domain name.
* A complete domain name must use dots (.) to separate domain names.
* Domain names must use only alphanumeric characters and dashes (-).
* Domain names must not begin or end with dashes (-).
* Domain names must mot have more than 63 characters.
* The top-level domain name must be one of the predefined top-level domain names, like (com), (org), or (ca)
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