Dear Nasim, I hope this letter finds you well. I have a question regarding the concept of "Post condition" that I previously discussed with you during the fourth week. You kindly requested me to send you an email, and mentioned that you would provide me with relevant materials and examples to help me better understand this concept. I have a clear understanding of "Precondition," which refers to the prerequisites needed for an action, but I am still struggling with a clear understanding of "Post condition." I was hoping you could provide me with some guidance on this matter. Thank you in advance for your assistance. Yours sincerely, Simon