如果存在则emphe的直接父节点emphe必定是emphCau中定义的emphe的起因事件；如果不是返回emphFalse；将事件emphe作为事件emphe重复查找直到emphe的所有父节点处理完毕;将上面文字转换为算法伪代码

function check_causal_chain(e, Cau):
    if e has a direct parent node e' and e' is defined in Cau as the cause of e:
        repeat until all parent nodes of e are processed:
            if e' has a direct parent node e'' and e'' is defined in Cau as the cause of e':
                set e' to e''
            else:
                return False
    else:
        return False
    return True