new prelude re-exports

src/prelude.rs

@@ -1,4 +1,7 @@
 pub use crate::utils::*;
 pub use anyhow::Error;
 pub use itertools::Itertools;
-pub use std::collections::{ HashMap as M, HashSet as S };
+pub use std::{
+    collections::{ HashMap as M, HashSet as S },
+    cmp::Ordering as Or,
+};