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  1. or download this
    BEGIN {
        require ab;
    ...
    
    $a::variable;
    &b::subroutine;
    
  2. or download this
    BEGIN {
        require ab;
        import a qw( $var sub );
        import b qw( sub2 sub3);
    }
    
  3. or download this
    use a qw( $var2 &sub );
    
    BEGIN {
        import b qw( $foo %bar );
    }