# Sequential Subset Randomizer restrictions

The following restrictions apply to the Sequential Subset Randomizer.

- The Sequential Subset Randomizer supports a maximum of 1000 subsets.
- If the length of a subset ID is not smaller than the length of the root key, the Sequential Subset Randomizer does not provide any special support for retrieval of the first root segment of the subset.
- If a subset ID does not start in the first position of the key of the root segment, the root addressable area must contain at least as many RAPs as the number of subsets.