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I'm looking to place a bulk order for custom children's book printing, specifically for a learning series aimed at kids. The total quantity would be 1,000 copies. I'm interested in understanding the options available in terms of design, paper quality, and any additional features that can enhance the final product. Please provide details about your production capabilities, lead times, and pricing for this order. Also, I'd appreciate any recommendations for popular themes or styles that work well for children's educational content. Looking forward to your prompt response!