| 11. | Within each exchange, random digits were added to form a complete telephone number, thus permitting access to listed and unlisted numbers.
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| 12. | Within each exchange, random digits were added to form a complete telephone number, permitting access to both listed and unlisted numbers.
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| 13. | Within each exchange, random digits were added to form a telephone number, thus permitting access to both listed and unlisted numbers.
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| 14. | For each exchange, the final four numerals were formed by random digits, thus permitting access to both listed and unlisted numbers.
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| 15. | And it is perhaps a poignant sign of the times that now when random digits disappear from people's lives they are mourned.
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| 16. | Within each exchange random digits were added to form a complete telephone number, thus permitting access to both listed and unlisted numbers.
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| 17. | Within each exchange, random digits were added to form a complete telephone number, thus permitting access to both listed and unlisted numbers.
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| 18. | Within each exchange, random digits were added to form a complete telephone number to permit access both to listed and unlisted numbers.
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| 19. | Some modern tests plot random digits as points on a three-dimensional plane, which can then be rotated to look for hidden patterns.
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| 20. | Within each exchange, random digits were added to form a complete telephone number, thus permitting access to listed and unlisted numbers alike.
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