->> Mappings created with "mmap" have similar semantics to those of data
->> demand-paged from executables, except that "mmap" mappings are written
->> back to their original files, not to swap. This implies that much of
->> their implementation can be shared. Explain why your implementation
->> either does or does not share much of the code for the two situations.
+>> C4: Mappings created with "mmap" have similar semantics to those of
+>> data demand-paged from executables, except that "mmap" mappings are
+>> written back to their original files, not to swap. This implies
+>> that much of their implementation can be shared. Explain why your
+>> implementation either does or does not share much of the code for
+>> the two situations.