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  _____      ___      _____    _    _      _____  
 / ____||   / _ \\   |__  //  | || | ||   / ___// 
/ //---`'  | / \ ||    / //   | || | ||   \___ \\ 
\ \\___    | \_/ ||   / //__  | \\_/ ||   /    // 
 \_____||   \___//   /_____||  \____//   /____//  
  `----`    `---`    `-----`    `---`   `-----`

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Text this: A coupled system of difference equations