first and second flange members disposed along the full length of opposing edges of said plate member, wherein the first flange member is disposed away from the upper surface of said plate in {HEAD ~ a direction} opposite to {TAIL ~ the direction} of said second flange member 
opposite to
first and second flange members disposed along the full length of opposing edges of said plate member , wherein the first flange member is disposed away from the upper surface of said plate in { HEAD ~ a direction } opposite to { TAIL ~ the direction } of said second flange member
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