How to add Stock Status to Category Page

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if ($special) {
                            $special = $this->currency->format($this->tax->calculate($special, $result['tax_class_id'], $this->config->get('config_tax')));
                        }                    
                    }

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$product_info = $this->model_catalog_product->getProduct($result['product_id']);
					
					if ($product_info['quantity'] <= 0) {
						$this->data['stock'] = $product_info['stock'];
					} else {
						if ($this->config->get('config_stock_display')) {
							$this->data['stock'] = $product_info['quantity'];
						} else {
						$this->data['stock'] = $this->language->get('text_instock');
						}
					}

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'special' => $special,

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'stock' => $this->data['stock'],

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$_['text_instock']      = 'In Stock'; 

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<?php echo $products[$j]['stock']; ?>

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<?php echo $products[$j]['stock']; ?>

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'special' => $special,

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'stock' => $this->data['stock'],

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$text_instock = $this->language->get('text_instock');

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$text_availability = $this->language->get('text_availability');

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<?php echo $products[$j]['stock']; ?>

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<b><?php echo $text_availability; ?></b> <?php echo $products[$j]['stock']; ?><br />