From Fedora core 1's kernel-2.4.22-1.2115.nptl.src.rpm:

19cb0d00854a760e270e680f1b9038dd  linux-2.4.22-ac1-nptl-A1.patch

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linux-2.4.22-1.2199.nptl.diff.bz2 is the difference between
linux-2.4.22.vanilla and redhat's linux-2.4.22-1.2199.nptl.srpm.