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Update 0_beacon-chain.md

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specs/core/0_beacon-chain.md
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@ -698,7 +698,7 @@ def get_active_validator_indices(validators: List[Validator], epoch: EpochNumber
```python
def get_permuted_index(index: int, list_size: int, seed: Bytes32) -> int:
"""
Return a pseudorandom permutation of `0...list_size-1` with ``seed`` as entropy.
Return `p(index)` in a pseudorandom permutation `p` of `0...list_size-1` with ``seed`` as entropy.
Utilizes 'swap or not' shuffling found in
https://link.springer.com/content/pdf/10.1007%2F978-3-642-32009-5_1.pdf