it is better if you prefix your identifier with a short namespace that identifies your plugin, theme or website that implements the custom post type.
For example:
acme_product or aw_product for products post type used by a hypothetical ACMEWidgets.com website
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Emailio Responsive Multipurpose Email Set+Builder - 1 views
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Brando Responsive & Multipurpose OnePage Template - 1 views
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