sieve.png

   _____ _____  ______ _____  _____ 
  / ____|  __ \|  ____/ ____|/ ____|
 | |    | |  | | |__ | (___ | |     
 | |    | |  | |  __| \___ \| |     
 | |____| |__| | |    ____) | |____ 
  \_____|_____/|_|   |_____/ \_____|