Function history 

pub fn history(
    calls: &[Held],
    keys: &BTreeSet<String>,
    l: &Lister<'_>,
) -> Vec<String>

A person’s calls of the last month (keys, their numbers as Sioul keys them), newest first, from every phone, rang or declined: one sentence each, for their sheet, never a count. Each says the phone only when several phones share their calls. A blocked caller’s never come: their calls never leave their phone.