Tenacious Tents manufacturers top of the line camping tents. The customers of Tenacious Tents expect, and usually receive, high-quality tents. The following chart is an accumulated list of all of the costs that Tenacious Tents acquired during the past year that relate to quality. Classify the items below into the following categories: prevention costs(P), appraisal costs(A), internal failure costs(I), and external failure(E) costs. Type the letter for each cost in the corresponding box.

Quality Cost Item	Category
Cost of product recalls
Costs incurred for routine maintenance of production equipment
Cost to satisfy warranty issues
Quality training costs for production line workers
Costs incurred to inspect products after manufacturing
Costs paid to rework tents that failed parts of inspection
Costs incurred to educate suppliers
Cost of scrapped tents that completely failed inspection
Costs incurred to handle customer complaints
Estimated lost sales due to unhappy customers
Cost for testing strength of seams