tracks/kotlin/exercises/phone-number/README.md in trackler-2.2.1.13 vs tracks/kotlin/exercises/phone-number/README.md in trackler-2.2.1.14
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`6139950253`
**Note:** As this exercise only deals with telephone numbers used in NANP-countries, only 1 is considered a valid country code.
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## Source
Event Manager by JumpstartLab [http://tutorials.jumpstartlab.com/projects/eventmanager.html](http://tutorials.jumpstartlab.com/projects/eventmanager.html)