One of the key challenges when looking for the causes of a complex event is to determine the causal status of factors that are neither individually necessary nor individually sufficient to produce that event. In order to reason about how such factors should be taken into account. we need a vocabulary to distinguish different cases. In philosophy. https://www.jmannino.com/hot-price-Reebok-Classic-Leather-Weiss-Grun-Gold-great-price/