Contribute correction: Advanced BASIC

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