Describir: Building Unit construction, prep. especially for home study

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