Constant BINOMIAL_MOD_2 

const BINOMIAL_MOD_2: [(i32, usize); 8];

C(n, k) % 2 This collapses to a special case of a product of only 4 possible values which are cyclic with a length of 128.

• C(0, 0) = 1
• C(1, 0) = 1
• C(1, 1) = 1
• C(0, 1) = 0