Function hwt::search::search4

pub fn search4(
    bits: u32, 
    feature: u128, 
    tws: [u32; 2], 
    radius: u32
) -> impl Iterator<Item = (usize, u32, usize, [u32; 4])>

Searches the four substrings with width bits of a feature.

The target weights tws must be known as well.