pfds package contain implementations of immutable, persistent
data structures. The implementations are mostly based on Chris Okasaki's
book Purely Functional Data Structures.
pfds package is located under the
in the Slogan source tree. You can install it from the REPL using the
install_package("pfds", 'local, "/path_to_slogan_src/pkgsrc/pfds")
Once installed, the package can be loaded to a program by calling the
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