diff --git a/src/8.guest/2022/composite.fs b/src/8.guest/2022/composite.fs
deleted file mode 100644
index ab1c21f..0000000
--- a/src/8.guest/2022/composite.fs
+++ /dev/null
@@ -1,51 +0,0 @@
-#version 400 core
-
-// shader outputs
-layout (location = 0) out vec4 frag;
-
-// color accumulation buffer
-layout (binding = 0) uniform sampler2D accum;
-
-// revealage threshold buffer
-layout (binding = 1) uniform sampler2D reveal;
-
-// epsilon number
-const float EPSILON = 0.00001f;
-
-// caluclate floating point numbers equality accurately
-bool isApproximatelyEqual(float a, float b)
-{
-	return abs(a - b) <= (abs(a) < abs(b) ? abs(b) : abs(a)) * EPSILON;
-}
-
-// get the max value between three values
-float max3(vec3 v) 
-{
-	return max(max(v.x, v.y), v.z);
-}
-
-void main()
-{
-	// fragment coordination
-	ivec2 coords = ivec2(gl_FragCoord.xy);
-	
-	// fragment revealage
-	float revealage = texelFetch(reveal, coords, 0).r;
-	
-	// save the blending and color texture fetch cost if there is not a transparent fragment
-	if (isApproximatelyEqual(revealage, 1.0f)) 
-		discard;
- 
-	// fragment color
-	vec4 accumulation = texelFetch(accum, coords, 0);
-	
-	// suppress overflow
-	if (isinf(max3(abs(accumulation.rgb)))) 
-		accumulation.rgb = vec3(accumulation.a);
-
-	// prevent floating point precision bug
-	vec3 average_color = accumulation.rgb / max(accumulation.a, EPSILON);
-
-	// blend pixels
-	frag = vec4(average_color, 1.0f - revealage);
-}
\ No newline at end of file