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pub trait Sampler<'a>: Sized {
    type Index: 'a;
    type Sample: 'a;

    fn get(&self, index: Self::Index) -> Self::Sample;
}

pub trait SamplerMut<'a>: Sized {
    type Index: 'a;
    type Sample: 'a;

    fn get(&mut self, index: Self::Index) -> Self::Sample;
}