diff --git a/src/display.rs b/src/display.rs
index 2b2659c..25319d3 100644
--- a/src/display.rs
+++ b/src/display.rs
@@ -82,169 +82,133 @@ impl SegmentPins {
 }
 
 #[derive(Clone, Copy, PartialEq, Eq)]
-pub struct Segment {
-    a: bool,
-    b: bool,
-    c: bool,
-    d: bool,
-    e: bool,
-    f: bool,
-    g: bool,
-    dp: bool,
-}
+pub struct Segment(u8);
 
 impl Segment {
     pub fn new() -> Segment {
-        Segment {
-            a: false,
-            b: false,
-            c: false,
-            d: false,
-            e: false,
-            f: false,
-            g: false,
-            dp: false,
-        }
+        Segment(0)
+    }
+
+    pub fn off(&mut self) -> &mut Self {
+        self.0 = 0;
+        self
+    }
+
+    pub fn a(&mut self) -> &mut Self {
+        self.0 |= 0b1000_0000;
+        self
+    }
+
+    pub fn b(&mut self) -> &mut Self {
+        self.0 |= 0b0100_0000;
+        self
+    }
+
+    pub fn c(&mut self) -> &mut Self {
+        self.0 |= 0b0010_0000;
+        self
+    }
+
+    pub fn d(&mut self) -> &mut Self {
+        self.0 |= 0b0001_0000;
+        self
+    }
+
+    pub fn e(&mut self) -> &mut Self {
+        self.0 |= 0b0000_1000;
+        self
+    }
+
+    pub fn f(&mut self) -> &mut Self {
+        self.0 |= 0b0000_0100;
+        self
+    }
+
+    pub fn g(&mut self) -> &mut Self {
+        self.0 |= 0b0000_0010;
+        self
+    }
+
+    pub fn dp(&mut self) -> &mut Self {
+        self.0 |= 0b0000_0001;
+        self
     }
 
     pub fn apply(&self, seg: &mut SegmentPins) {
         seg.set_off();
-        if self.a {
+        if self.0 & 0b1000_0000 != 0 {
             seg.set_a();
         }
-        if self.b {
+        if self.0 & 0b0100_0000 != 0 {
             seg.set_b();
         }
-        if self.c {
+        if self.0 & 0b0010_0000 != 0 {
             seg.set_c();
         }
-        if self.d {
+        if self.0 & 0b0001_0000 != 0 {
             seg.set_d();
         }
-        if self.e {
+        if self.0 & 0b0000_1000 != 0 {
             seg.set_e();
         }
-        if self.f {
+        if self.0 & 0b0000_0100 != 0 {
             seg.set_f();
         }
-        if self.g {
+        if self.0 & 0b0000_0010 != 0 {
             seg.set_g();
         }
-        if self.dp {
+        if self.0 & 0b0000_0001 != 0 {
             seg.set_dp();
         }
     }
 
-    pub fn off(&mut self) -> &mut Self {
-        self.a = false;
-        self.b = false;
-        self.c = false;
-        self.d = false;
-        self.e = false;
-        self.f = false;
-        self.g = false;
-        self.dp = false;
-        self
-    }
-
     pub fn num(&mut self, no: u8) -> &mut Self {
         match no {
             0 => {
-                self.a = true;
-                self.b = true;
-                self.c = true;
-                self.d = true;
-                self.e = true;
-                self.f = true;
+                self.a().b().c().d().e().f();
             }
             1 => {
-                self.b = true;
-                self.c = true;
+                self.b().c();
             }
             2 => {
-                self.a = true;
-                self.b = true;
-                self.g = true;
-                self.e = true;
-                self.d = true;
+                self.a().b().g().e().d();
             }
             3 => {
-                self.a = true;
-                self.b = true;
-                self.g = true;
-                self.c = true;
-                self.d = true;
+                self.a().b().g().c().d();
             }
             4 => {
-                self.f = true;
-                self.g = true;
-                self.b = true;
-                self.c = true;
+                self.f().g().b().c();
             }
             5 => {
-                self.a = true;
-                self.f = true;
-                self.g = true;
-                self.c = true;
-                self.d = true;
+                self.a().f().g().c().d();
             }
             6 => {
-                self.a = true;
-                self.f = true;
-                self.g = true;
-                self.c = true;
-                self.d = true;
-                self.e = true;
+                self.a().f().g().c().d().e();
             }
             7 => {
-                self.a = true;
-                self.b = true;
-                self.c = true;
+                self.a().b().c();
             }
             8 => {
-                self.a = true;
-                self.b = true;
-                self.c = true;
-                self.d = true;
-                self.e = true;
-                self.f = true;
-                self.g = true;
+                self.a().b().c().d().e().f().g();
             }
             9 => {
-                self.a = true;
-                self.b = true;
-                self.c = true;
-                self.d = true;
-                self.f = true;
-                self.g = true;
+                self.a().b().c().d().f().g();
             }
             _ => panic!("Num out of range"),
         }
         self
     }
 
-    pub fn dp(&mut self) -> &mut Self {
-        self.dp = true;
-        self
-    }
-
     pub fn minus(&mut self) -> &mut Self {
-        self.g = true;
-        self
+        self.g()
     }
 
     pub fn prompt(&mut self) -> &mut Self {
-        self.d = true;
-        self
+        self.d()
     }
 
-    pub fn e(&mut self) -> &mut Self {
-        self.a = true;
-        self.d = true;
-        self.e = true;
-        self.f = true;
-        self.g = true;
-        self
+    pub fn sym_e(&mut self) -> &mut Self {
+        self.a().d().e().f().g()
     }
 }
 
@@ -293,7 +257,7 @@ impl DispalyState {
         self[1].off();
         self[2].off();
         self[3].off().minus();
-        self[4].off().e();
+        self[4].off().sym_e();
         self[5].off().minus();
         self[6].off();
         self[7].off();