Function choose 

pub(crate) fn choose(key: &str, taken: bool) -> String

You chose, seeing answers that differ (DoseRow::choose): taken (at the time the earliest “taken” said, else now), or not taken. Your answer here, every answer saying otherwise taken out, on purpose; the marks beside, for an older Sioul, as you chose; not taken after all, the doses its take moved go back. Returns what went wrong, else “”.