| 11. | Why do people add leading zeros to dates around here?
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| 12. | The leading zero is always omitted when dialling from outside the country.
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| 13. | :Here's a counterexample which uses leading zeros.
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| 14. | The 4 numbers are between 1 and 9999 with no leading zero.
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| 15. | This can be fixed with leading zeros : 02 comes alphabetically before 11.
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| 16. | Notice that leading zeros are permitted to form a 6-digit pattern.
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| 17. | What's the purpose of that leading zero?
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| 18. | Sometimes leading zeros or other tricks may be needed.
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| 19. | In some instances, a leading zero may be used to distinguish a number.
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| 20. | First add a leading zero if the room has an odd number of digits.
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