Голубые тротуары синие цветы
Ярко-желтые трамваи розовые сны

https://code.google.com/p/include-what-you-use/

The main goal of include-what-you-use is to remove superfluous #includes. It does this both by figuring out what #includes are not actually needed for this file (for both .cc and .h files), and replacing #includes with forward-declares when possible.