pub(crate) fn install_systems(
session: &mut Session<Playground>,
domain: DomainHandle<EuclideanR4>,
layers: Layers,
cards: Arc<[Card]>,
)pub(crate) fn install_systems(
session: &mut Session<Playground>,
domain: DomainHandle<EuclideanR4>,
layers: Layers,
cards: Arc<[Card]>,
)