Note: We are native African speakers from various African countries and we collaborate with volunteers from Universities and colleges around the world. We use professional graphic artist and reputable printing services. But the translation part is a volunteer effort and we acknowledge for potential dialect grammatical differences that definitely something that gets overlooked frequently. Please contact us if you notice any issue with our books. We will immediately address your issue with our review panel and we send free and corrected replacement within few weeks. Thank you for your input and support!