diff --git a/src/main.rs b/src/main.rs
index 23280f2..c058787 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -22,7 +22,7 @@ struct Velocity(f64, f64);
 struct VelocitySystem;
 impl System for VelocitySystem {
     fn on_update(&self, ctx: &mut engine::Context, delta: f64) -> Result<(), engine::Error> {
-        for id in engine::Quwi::<(Velocity, Position)>::new().run(&ctx) {
+        for id in run_quwi::<Velocity, Position>(ctx) {
             let vel = ctx.entity_component::<Velocity>(id).clone();
             let Position(x, y) = ctx.entity_component::<Position>(id);
             *x += vel.0 * delta;
@@ -38,7 +38,7 @@ struct Gravity;
 struct GravitySystem;
 impl System for GravitySystem {
     fn on_update(&self, ctx: &mut engine::Context, delta: f64) -> Result<(), engine::Error> {
-        for id in engine::Quwi::<(Gravity, Velocity)>::new().run(&ctx) {
+        for id in run_quwi::<Gravity, Velocity>(ctx) {
             let Velocity(_, y) = ctx.entity_component::<Velocity>(id);
             *y = if *y < 800.0 { *y + 400.0 * delta } else { *y };
         }
@@ -64,12 +64,12 @@ impl System for CloudSystem {
             ]);
         }
 
-        for id in engine::Quwi::<(Cloud, Velocity)>::new().run(&ctx) {
+        for id in run_quwi::<Cloud, Velocity>(ctx) {
             let Velocity(x, _) = ctx.entity_component::<Velocity>(id);
             *x = if *x < 200.0 { *x + 200.0 * delta } else { *x };
         }
 
-        for id in engine::Quwi::<(Cloud, Position)>::new().run(&ctx) {
+        for id in run_quwi::<Cloud, Velocity>(ctx) {
             let Position(x, _) = ctx.entity_component::<Position>(id);
             if *x > 1400.0 {
                 ctx.despawn(id);
@@ -79,10 +79,14 @@ impl System for CloudSystem {
     }
 }
 
+fn run_quwi<A: 'static + Component, B: 'static + Component>(ctx: &mut engine::Context) -> Vec<u64> {
+    engine::Quwi::<(A, B)>::new().run(&ctx)
+}
+
 struct SpriteRenderer;
 impl System for SpriteRenderer {
     fn on_update(&self, ctx: &mut engine::Context, _delta: f64) -> Result<(), engine::Error> {
-        for id in engine::Quwi::<(Sprite, Position)>::new().run(&ctx) {
+        for id in run_quwi::<Sprite, Position>(ctx) {
             let &mut Position(x, y) = ctx.entity_component::<Position>(id);
             let sprite = ctx.entity_component::<Sprite>(id).sprite;
 
@@ -98,7 +102,7 @@ struct PlayerMovement;
 struct PlayerMovementSystem;
 impl System for PlayerMovementSystem {
     fn on_update(&self, ctx: &mut engine::Context, _delta: f64) -> Result<(), engine::Error> {
-        for id in engine::Quwi::<(PlayerMovement, Velocity)>::new().run(&ctx) {
+        for id in run_quwi::<PlayerMovement, Velocity>(ctx) {
             let d_down = ctx.key_pressed(engine::Keycode::D);
             let a_down = ctx.key_pressed(engine::Keycode::A);
             let Velocity(x, _) = ctx.entity_component::<Velocity>(id);