diff --git a/src/main.rs b/src/main.rs
index d559a6a..c215a27 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,6 +16,8 @@ fn display(grid: &[[bool; WIDTH]; HEIGHT], buffer: &mut String) {
 }
 
 fn count(grid: &[[bool; WIDTH]; HEIGHT], x: usize, y: usize) -> u8 { 
+    
+    // (i, j) coordinate
     let near:[(isize, isize); 8] = [
         (-1, -1), (-1, 0), (-1, 1),
          (0, -1),           (0, 1),
@@ -25,13 +27,13 @@ fn count(grid: &[[bool; WIDTH]; HEIGHT], x: usize, y: usize) -> u8 {
     let mut count = 0;
 
     for (i, j) in near {
-        let nx: isize = x as isize + i;
-        let ny: isize = y as isize + j;
+        let nx: isize = x as isize + j;
+        let ny: isize = y as isize + i;
 
-        if (nx > 0 && (WIDTH as isize) > nx && 
-            ny > 0 && (HEIGHT as isize) > ny) {
+        if nx >= 0 && (WIDTH as isize) > nx && 
+            ny >= 0 && (HEIGHT as isize) > ny {
             
-            if (grid[nx as usize][nx as usize]) {
+            if grid[ny as usize][nx as usize] {
                 count += 1;
             }
         }
@@ -43,10 +45,10 @@ fn count(grid: &[[bool; WIDTH]; HEIGHT], x: usize, y: usize) -> u8 {
 fn generation(grid: &[[bool; WIDTH]; HEIGHT]) -> [[bool; WIDTH]; HEIGHT] {
     let mut new_grid = [[false; WIDTH]; HEIGHT];
 
-    for x in 0..HEIGHT {
-        for y in 0..WIDTH {
+    for y in 0..HEIGHT {
+        for x in 0..WIDTH {
             let count = count(grid, x, y);
-            new_grid[x][y] = match (grid[x][y], count) {
+            new_grid[y][x] = match (grid[y][x], count) {
                 (true, 2) | (true, 3) => true,
                 (false, 3) => true,
                 _ => false,
@@ -61,8 +63,15 @@ fn main() {
     let mut grid: [[bool; WIDTH]; HEIGHT] = [[false; WIDTH]; HEIGHT];
     let mut buffer: String = String::new();
     
+    // grid[14][13] = true;
+    // grid[15][14] = true;
+    // grid[13][15] = true;
+    // grid[14][15] = true;
+    // grid[15][15] = true;
+
     loop {
         display(&grid, &mut buffer);
         grid = generation(&grid);
+        std::thread::sleep(std::time::Duration::from_millis(500));
     }
 }