Causes must occur before effects. So causal relations are irreflexive and asymmetric. Causes are also transitive-along-causal-pathways in that along a given causal pathway, to causally contribute to something that causally contributes to an effect is to causally contribute to that effect. This may generate counterintuitive judgement where a feature causally contributes both to an effect occurring and to it not occurring along different pathways. But these results should be accepted, we argue, because it is often important to know both are occurring (even though at the cost of complicating relations between causal contributions and legal or moral responsibility). Notational conventions are outlined.