'Techworks' is a company selling electronic products. To keep track of inventory and manage sales efficiency each and every item in the inventory is assigned a unique code which signifies certain aspects of the item. Its unique code is a combination of alpha and numeric and is used not only for data collection, but also for further manipulation for deriving meaningful statistics and decision-making. However, over time, due to advancement in technology, certain items may not be used and their demand drops off. 'Techworks' faces a challenge of dealing with these products, particularly with technology evolving quickly. Some of the items that make up the inventory of 'Techworks' as discussed above are ____________ and ____________.