{HEAD ~ The lightweight metal construction system} begins with {TAIL ~ a beam} formed from a single piece of cold formed sheet steel or other sheet metal which is bent lengthwise along four lines to form a triangular cross section with two wings, side by side, extending from its apex 
{ HEAD ~ The lightweight metal construction system } begins with { TAIL ~ a beam } formed from a single piece of cold formed sheet steel or other sheet metal which is bent lengthwise along four lines to form a triangular cross section with two wings , side by side , extending from its apex
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