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Add missing instructions for non-happy paths in "Phone Number" exercise #567

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Add missing instructions for non-happy paths in "Phone Number" exercise #567

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2 changes: 2 additions & 0 deletions exercises/practice/phone-number/.docs/instructions.md
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Expand Up @@ -31,4 +31,6 @@ should all produce the output

`6139950253`

Any invalid phone number should produce a `null` output.

**Note:** As this exercise only deals with telephone numbers used in NANP-countries, only 1 is considered a valid country code.