diff --git a/src/util.rs b/src/util.rs
index 2919180..8ec3537 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -1,4 +1,7 @@
-use std::{fmt::Display, num::NonZeroU8};
+use std::{
+	fmt::{Debug, Display},
+	num::NonZeroU8,
+};
 
 use termion::color::{self, Color};
 
@@ -34,7 +37,7 @@ impl Display for Player {
 	}
 }
 
-#[derive(PartialEq, Eq, Clone, Copy)]
+#[derive(PartialEq, Eq, Clone, Copy, Hash)]
 pub enum Symb {
 	Number(NonZeroU8),
 	Zero,
@@ -47,13 +50,19 @@ pub enum Symb {
 impl Display for Symb {
 	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 		match self {
-			Self::Number(x) => x.fmt(f),
-			Self::Zero => '0'.fmt(f),
-			Self::Plus => '+'.fmt(f),
-			Self::Minus => '-'.fmt(f),
-			Self::Div => '÷'.fmt(f),
-			Self::Times => '×'.fmt(f),
+			Self::Number(x) => write!(f, "{x}")?,
+			Self::Zero => write!(f, "0")?,
+			Self::Plus => write!(f, "+")?,
+			Self::Minus => write!(f, "-")?,
+			Self::Div => write!(f, "÷")?,
+			Self::Times => write!(f, "×")?,
 		}
+		Ok(())
+	}
+}
+impl Debug for Symb {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		Display::fmt(self, f)
 	}
 }