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The C and C++ Include Header Files

cat -n /usr/include/c++/15/ext/pb_ds/detail/unordered_iterator

'cat -n /usr/include/c++/15/ext/pb_ds/detail/unordered_iterator' is not a recognized file under /usr/include. Check the path and try again, e.g.: cat -n /usr/include/c++/15/ostream