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backstop method 2nd
basename subroutine (File::Basename)
BEGIN block
    importing subroutines
    purpose
    setting constants
    setting paths
    use list and
    use operation and
behavior
    classes and
    instances and
    passing as parameter
    subroutine references and
    testing with isa and can methods 2nd
blessed references
    indirect object syntax and
    instances as 2nd 3rd
    isa method and
    nested object destruction
    ref operator and
    returning
block form
    grep operator
    map operator