The Two Sides of Mary Wells was created in 1966.
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Two Sides to Every Story was created in 1976.
Side-Angle-Side is a rule used in geometry to prove triangles congruent. The rule states that if two sides and the included angle are congruent to two sides and the included angle of a second triangle, the two triangles are congruent. An included angle is an angle created by two sides of a triangle.
Triangles by definition have three sides; a two-sided triangle is impossible. In fact, no closed geometrical figure can be created out of only two straight lines. An angle is not closed. A vesica piscis is not made of straight lines. (This is the lens-like shape created in the intersection of two circles.)
A PLANE has two sides
a trapezoid