The following produces the same output without the join. It just seems simpler to me, but it's all a matter of personal preference: 
print "$building_material[0] $phrase_glue[0] $building_outcome[0],\n";

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In reply to Re^3: London Bridge (build it up with lots of arrays, lots of array, lots of arrays) by toolic
in thread London Bridge (build it up with lots of arrays, lots of array, lots of arrays) by KurtSchwind

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