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Back/ (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff col_left = h_margin; col_right = width_mm - thickness; // draw panel, subtract holes union() { difference(){ railRect(height); railSlot(height); railSupportCavity(height); } } // } elseif ($alt_text == $article['title'] || strpos($article['title'], $alt_text) !== False) { if (preg_match("@.*(