diff --git a/src/step.wgsl b/src/step.wgsl
index 09494c3..3f9906d 100644
--- a/src/step.wgsl
+++ b/src/step.wgsl
@@ -23,8 +23,11 @@ fn on_fragment(in: Varying) -> @location(0) u32 {
 	let state = a.y;
 	let n = a.x + a.z + a.w + b.x + b.y + c.y + c.z + d.y;
 	switch (n) {
-	case 2u: { return state; }
 	case 3u: { return 1u; }
+	case 4u: { return state; }
+	case 6u: { return 1u; }
+	case 7u: { return 1u; }
+	case 8u: { return 1u; }
 	default: { return 0u; }
 	}
 }