Gumená redukcia

  ____    _              _____   _____    __ 
 |  _ \  | |__     ___  |  ___| | ____|  / _|
 | |_) | | '_ \   / _ \ | |_    |  _|   | |_ 
 |  __/  | |_) | |  __/ |  _|   | |___  |  _|
 |_|     |_.__/   \___| |_|     |_____| |_|