en.wikipedia.org
en.wikipedia.org
telephoneworld.org
en.wikipedia.org
merriam-webster.com
gbppr.net
gbppr.net
https://gbppr.net › bsp › 11-DDD.pdf
collinsdictionary.com
blogs.ubc.ca
thefreedictionary.com
The Free Dictionary
https://www.thefreedictionary.com › direct+distance+dialing
dictionary.com
alchetron.com
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