21. Although modern filters are meant to be retrievable , complications may prevent some from being removed. 22. Often in earlier decades these smudges were ignored because very little of their detail was retrievable . 23. Among Discovery's major activities will be the deployment Saturday of a retrievable satellite called Spartan. 24. Sputnik 2 was not designed to be retrievable , and Laika had always been intended to die. 25. The information is publicly available and " de facto " retrievable forever via media archives. 26. If an appropriate pre-learned schema is retrievable , then a survival response will be initiated. 27. A short, easily retrievable , wooden ladder could then be used to reach the elevated entrance. 28. The primary mission of this flight was the retrieval of the European Retrievable Carrier satellite ( EURECA ). 29. If the packer is retrievable it can be released easily enough and pulled out with the completion string. 30. China has successfully launched 17 retrievable satellites since 1975, recovering all but one, the news agency said.
