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<p>allowed the general <a href="page.php?w=cubic_equation">cubic equation</a> to be solved using origami.</p>

<p>In 1949, R C Yeates' book "Geometric Methods" described three allowed constructions corresponding to the first, second, and fifth of the Huzita-Hatori axioms.</p>

<p>The <a href="page.php?w=Yoshizawa-Randlett_system">Yoshizawa-Randlett system</a> of instruction by diagram was introduced in 1961.</p>

<p>In 1980 a construction was reported which enabled an angle to be trisected. Trisections are impossible under Euclidean rules.</p>

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