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In Salesforce land there is Universal Containers which is used in Training, and to great effect on AutomationChampion blog for his business use-cases, and I did not know about the Warehousing App, so I will have to try that one out too.
Other Data
Files
This site is good http://www.sample-videos.com/
Phone Numbers
Australian fictional phone numbers can be found at https://www.acma.gov.au/choose-your-phone-number
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