None, since there can be no conversion.
A linear (or lineal) yard is a measure of length in 1-dimensional space. A square foot is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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The answer is none. Square feet measures area. Lineal yards is a measure of length. You can't convert the two.