diff --git a/2023/src/day03.rs b/2023/src/day03.rs
index b531ef8..97fac08 100644
--- a/2023/src/day03.rs
+++ b/2023/src/day03.rs
@@ -50,12 +50,7 @@ impl<'a> Index<usize> for Grid<'a> {
 
 fn is_surrounded(grid: &Grid<'_>, y: usize, start: usize, last: usize) -> bool {
     fn is_symbol(c: u8) -> bool {
-        match c {
-            b'0'..=b'9' => false,
-            b'.' => false,
-            b'\n' => false,
-            _ => true,
-        }
+        !matches!(c, b'0'..=b'9' | b'.' | b'\n')
     }
     let x_min = start.saturating_sub(1);
     let x_max = Ord::min(grid.width(), last + 2);
diff --git a/2023/src/samples/03.txt b/2023/src/samples/03.txt
new file mode 100644
index 0000000..b20187f
--- /dev/null
+++ b/2023/src/samples/03.txt
@@ -0,0 +1,10 @@
+467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..