sieve.png

  ______ ______ ________     ________ 
 |  ____|  ____|  ____\ \   / /  ____|
 | |__  | |__  | |__   \ \_/ /| |__   
 |  __| |  __| |  __|   \   / |  __|  
 | |    | |____| |       | |  | |____ 
 |_|    |______|_|       |_|  |______|