Final answer:
Written constitutions and an independent judiciary prevent voters and their representatives from erasing liberal rights.
Step-by-step explanation:
The pair of elements that prevent voters and their representatives from erasing liberal rights are Written constitutions and an independent judiciary. Written constitutions enshrine fundamental principles and rights that cannot be easily changed or erased. An independent judiciary ensures that these rights are upheld and protected, even if the majority of voters or their representatives may want to erode them.
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