Suppose that we try to collect amber. However, there is the risk of also collecting white phosphorus. Suppose that we collect 50 objects. We keep all of them in water to avoid fire hazards. We classify 30 objects as amber and 20 as white phosphorus. However, two of the objects classified as amber are actually pieces of white phosphorus and 8 objects classified as white phosphorus are actually consisting of amber. Compute the precision, recall, accuracy, and specificity for this classification!