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  1. or download this
    use strict qw(@ISA);
    
  2. or download this
    $ perl5.8.1 -Mstrict=@ISA -e '$foo = 1'
    Unknown 'strict' tag(s) '@ISA' at -e line 0
    BEGIN failed--compilation aborted.
    
  3. or download this
    $ perl5.8.0 -Mstrict=@ISA -e '$foo = 1'
    
  4. or download this
    $ perl5.8.0 -Mstrict -e '$foo = 1'
    Global symbol "$foo" requires explicit package name at -e line 1.
    Execution of -e aborted due to compilation errors.