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    for ($i=0; $i<=$length2; $i+=2){
        push @array2, $array[$i];
...
    for ($i=1; $i<=$length; $i+=2){
        push @array2, $array[$i];
    }

    for $i(0..$length/2){
        push @array2, $array[$i*2];
...
    for $i(0..$length/2){
        push @array2, $array[$i*2+1];
    }