# BitSet > ⚠️ **Experimental — generated with no human supervision** by the daily MCP pipeline to exercise gno tooling. Not audited. See [r/moul/x/daily](https://github.com/moul/gno-contracts/blob/main/r/moul/x/daily/README.md). --- Sieves the primes under 100 into a bit set and shows the set algebra on two small sets, rendered as a table. Demo of the [`p/moul/x/daily/bitset`](https://github.com/moul/gno-contracts/tree/main/p/moul/x/daily/bitset/v0) library — storage, popcount and every set operation come from the package; this realm does no bit-twiddling of its own. Stateless and read-only, so `Render` is fully deterministic. The sieve is a nice fit: the bit set is used *twice*, once as the composite marker and once as the result, which is exactly what a dense bit vector is for. Built for gno 0.9. --- Part of **[moul/gno-contracts](https://github.com/moul/gno-contracts)** — moul's versioned gno.land contracts. See the repository for the full catalog, build/test tooling, and usage. **Dependency graph:** ![gno.land/r/moul/x/daily/bitsetdemo/v0 dependency graph](https://raw.githubusercontent.com/moul/gno-contracts/main/_assets/gno.land/r/moul/x/daily/bitsetdemo/v0/deps.png) > 🧪 **Highly experimental — potentially vibe-coded.** Not audited; may break, change, or be removed at any time. Do not use with anything of value. Full disclaimer: [DISCLAIMER](https://github.com/moul/gno-contracts/blob/main/DISCLAIMER.md).