A tow of 9 barges is made up three abreast by three long. The towboat is faced up to the last barge of the center string. What is the name of the outer two strings of barges?
A tow of 9 barges is made up three abreast by three long. The towboat is faced up to the last barge of the center string. What is the name of the outer two strings of barges?
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