sieve.png

   _____ _____ _________      ______  
  / ____|_   _|__   __\ \    / /  _ \ 
 | |      | |    | |   \ \  / /| |_) |
 | |      | |    | |    \ \/ / |  _ < 
 | |____ _| |_   | |     \  /  | |_) |
  \_____|_____|  |_|      \/   |____/