usebitset_matrix::BitMatrix;fnmain(){// naive demonstration of candidate sets per cell using a 9x9 matrix of candidates
letmut cand =BitMatrix::new(9,9);// set candidate for cell (0,0) = 1 as true
cand.set(0,0,true);println!("candidate (0,0)=1: {}", cand.get(0,0));}