diff --git a/day3/src/main.rs b/day3/src/main.rs
index 7aec75a..6c52d37 100644
--- a/day3/src/main.rs
+++ b/day3/src/main.rs
@@ -31,11 +31,11 @@ fn init() -> eyre::Result<()>
     color_eyre::install()
 }
 
-#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, Clone, PartialEq, Eq)] //TODO: implement PartialEq, Eq, PartialOrd, Ord via intersection between `full`s
 struct Sack {
     split_by: usize,
     containers: Vec<BTreeSet<char>>,
-    full: BTreeSet<char>,
+    full: smallmap::Set<char>, //TODO: When doing the above ^, change to BTreeSet for `intersection()`
 }
 
 impl Sack
@@ -80,7 +80,7 @@ impl std::str::FromStr for Sack
 		first.chars().collect(),
 		second.chars().collect(),
 	    ],
-	    full: s.chars().collect(),
+	    full: s.chars().map(|a| (a, ())).collect(),
 	})
     }
 }