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TEMP_HASH_BLOCK: {
    my %temphash;
    @temphash{@array1} = ();
    delete @temphash{@array1};
    my @newarray = keys %temphash;
}

 my @newarray = do {
    my %temphash;
    @temphash{@array1} = ();
    delete @temphash{@array1};
    keys %temphash;
};