Sorry, no online dictionaries contain the exact phrase when necessary.
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Reverse dictionary results:
1. if needed
 2. as required
3. when required
4. if necessary
5. any
6. applicable
7. appropriate
8. desirable
9. equipment
10. essential
 11. have
12. held
13. imperative
14. integral
15. location
16. measures
17. must
18. necessaries
19. need
20. needed
 21. needful
22. needs
23. place
24. relevant
25. require
26. required
27. requirements
28. requires
29. requisite
30. resources
 31. site
32. suitable
33. support
34. take
35. takes
36. unnecessary
37. venue
38. vital
39. want
40. warranted

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