Please answer this: Information:  - HMY Fairy was a small royal yacht and tender to the HMY Victoria and Albert . Built in 1844 by Ditchburn and Mare at Leamouth , she was commissioned in 1845 . She was 146 feet long with a beam of 21 feet and was 312 tons burden , and was able to cruise in shallow waters and as well as her duties as a tender , she sailed from London to Scotland and conveyed the Royal family to the Isle of Wight . She was replaced by the HMY Alberta in 1863 .  - Leamouth is the land, traditionally in Poplar, immediately west of the River Lea where it joins the River Thames at . Its northern half lies within a small meander of the Lea named after its reach as "Goodluck Hope". The south-eastern part, known as "Orchard Place" is bounded by a local thoroughfare with trees, the remaining small East India Dock Basin, the Lea and the Thames.  - An emperor (through Old French "empereor" from ) is a monarch, usually the sovereign ruler of an empire or another type of imperial realm. Empress, the female equivalent, may indicate an emperor's wife ("empress consort"), mother ("empress dowager"), or a woman who rules in her own right ("empress regnant"). Emperors are generally recognized to be of a higher honour and rank than kings. In Europe the title of Emperor was, since the Middle Ages, considered equal or almost equal in dignity to that of Pope, due to the latter's position as visible head of the Church and spiritual leader of Western Europe. The Emperor of Japan is the only currently reigning monarch whose title is translated into English as "Emperor".  - A monarch is the sovereign head of state in a monarchy. A monarch may exercise the highest authority and power in the state, or others may wield that power on behalf of the monarch. Typically a monarch either personally inherits the lawful right to exercise the state's sovereign rights (often referred to as "the throne" or "the crown") or is selected by an established process from a family or cohort eligible to provide the nation's monarch. Alternatively, an individual may become monarch by conquest, acclamation or a combination of means. A monarch usually reigns for life or until abdication.   - The River Thames is a river that flows through southern England. At , it is the longest river entirely in England and the second longest in the United Kingdom, after the River Severn. It also flows through Oxford (where it is called Isis), Reading, Henley-on-Thames and Windsor. The lower reaches of the river are called the Tideway, derived from its long tidal reach up to Teddington Lock. It rises at Thames Head in Gloucestershire, and flows into the North Sea via the Thames Estuary. The Thames drains the whole of Greater London.   - A royal yacht is a ship used by a monarch or a royal family. If the monarch is an emperor the proper term is imperial yacht. Most of them are financed by the government of the country of which the monarch is head. The royal yacht is most often manned by personnel from the navy and used by the monarch and his/her family on both private and official travels.  - The River Lea (or Lee) in England originates in Marsh Farm, Leagrave, Luton in the Chiltern Hills and flows generally southeast, east, and then south through east London where it meets the River Thames, the last section being known as Bow Creek. It is one of the largest rivers in London and the easternmost major tributary of the Thames. Its valley creates a long chain of marshy ground along its lower length, much of which has been used for gravel and mineral extraction, reservoirs and industry. The river has been canalised to provide a navigable route for boats into eastern Hertfordshire, known as the Lee Navigation. While the lower Lea remains somewhat polluted, its upper stretch and tributaries, classified as chalk streams, are a major source of drinking water for London. A diversion known as the New River, opened in 1613, abstracts clean water away from the lower stretch of the river for drinking. Its origins in the Chilterns contribute to the extreme hardness (high mineral content) of London tap water.  - A meander, in general, is a bend in a sinuous watercourse or river. A meander forms when moving water in a stream erodes the outer banks and widens its valley, and the inner part of the river has less energy and deposits silt. A stream of any volume may assume a "meandering" course, alternately eroding sediments from the outside of a bend and depositing them on the inside. The result is a "snaking" pattern as the stream meanders back and forth across its down-valley axis. When a meander gets cut off from the main stream, an oxbow lake forms. Over time meanders migrate downstream, sometimes in such a short time as to create civil engineering problems for local municipalities attempting to maintain stable roads and bridges.    What is the relationship between 'hmy fairy' and 'ship'?
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Please answer this: Information:  - Tower defense is a subgenre of real - time strategy video games , where the goal is to stop the enemies from reaching a specific point on the map by building a variety of different towers which shoot at them as they pass . Enemies and towers usually have varied abilities , costs , and upgrade prices . When an enemy is defeated , the player earns money or points , which are used to buy or upgrade towers , or upgrade the number of money or points that are earned , or even upgrade the rate at which they upgrade . The choice and positioning of the personal towers is the essential strategy of the game . Many games , such as Flash Element Tower Defense feature enemies that run through a `` maze '' , which allows the player to strategically place towers for optimal effectiveness . However , some versions of the genre force the user to create the maze out of their own towers , such as Desktop Tower Defense . Some versions are a hybrid of these two types , with preset paths that can be modified to some extent by tower placement , or towers that can be modified by path placement .  - Real-time strategy (RTS) is a subgenre of strategy video games where the game does not progress incrementally in turns.  - Strategy video games are a video game genre that focuses on skillful thinking and planning to achieve victory. It emphasizes strategic, tactical, and sometimes logistical challenges. Many games also offer economic challenges and exploration. They are generally categorized into four sub-types, depending on whether the game is turn-based or real-time, and whether the game focuses on strategy or tactics.    What is the relationship between 'tower defense' and 'video game genre'?
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Answer:
instance of