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<p>integration of frames, rules, and object-oriented programming was significantly driven by commercial ventures such as KEE and Symbolics spun off from various research projects. At the same time, there was another strain of research that was less commercially focused and was driven by mathematical logic and automated theorem proving. One of the most influential languages in this research was the <a href="page.php?w=KL-ONE">KL-ONE</a> language of the mid-'80s. KL-ONE was a <a href="page.php?w=frame_language">frame language</a> that had a rigorous</p><p>
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