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This Python program runs in 37ms.

Solution:The smallest possible number of hurdles given to each farmer is 70.One pair of farmers would each enclose an area of 250 sq hurdles (13 square + 9 square and 15 square + 5 square), the other pair would each enclose an area of 265 sq hurdles (12 square + 11 square and 16 square + 3 square).