Gumená redukcia

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