struct ImportantExcerpt<'a, 'b> {
    part_a: &'a str,
    part_b: &'b str,
}

impl<'c, 'd> ImportantExcerpt<'c, 'd> {
}

impl<'f> ImportantExcerpt<'f, 'f> {

}

impl<'g, 'h: 'g> ImportantExcerpt<'g, 'h> {


}

// impl for the static lifetime
impl ImportantExcerpt<'static, 'static> {

}

// when you don't need the names for anything else
impl ImportantExcerpt<'_, '_> {
}