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Related Clues:
- Not fixed
- Not set in stone
- Fickle
- Inconsistent
- Apt to change
- Subject to change
- Inconstant
- X or Y, in algebra
- Unstable, in the lab
- Changeable
- Capable of change
- Apt to fluctuate
- In the answers to 17-, 34- and 57-Across, it was replaced in turn by 1, 2, 3, 4, 5 ...
- Changing
- Unstable and liable to change