Are the FM9 patches cumulative?

Hello

I looked on the updates page for FM9 and there are 4 different patches.  Each one has a readme file that lists what is fixed in the patch.  Nowhere does it say if each consecutive patch is cumulative.  In other words, if I install patch 4, do I get all the fixes in 1, 2, and 3?  Or do I need to install each patch to get all the fixes?

Thanks

Gary