Combine is an OCaml library for combinatorics problem solving formed by several modules:
- Dlx: implements Knuth's dancing links
- Zdd: implements Zero-suppressed binary decision diagrams
- Emc: a common interface to modules Dlx and Zdd to solve the Exact Matrix Cover problem
- Tiling: converts a 2D tiling problem into an EMC problem
Combine also contains an interpreter for a language (combine) to describe 2D tiling problems (such as Pentominos) and solve them or counting their solutions. The archive contains some examples.