Acknowledgement

    First of all and foremost, I would like to thank my parents for their love and support throughout my life. Thank you both for giving me strength to reach for the stars and chase my dreams. My sister and brother desire my wholehearted thanks as well.

I would like to sincerely thank all my teachers throughout my entire academic journey for their  guidance and support throughout my studies and especially for their confidence in me.

To all my friends, thank you for understanding and encouragement in many, many moments of crisis. Your friendship makes my life a wonderful experience. I cannot mention all names here, but you are always on my mind.

All praise is due to God alone ( "Alhamdulillah"  ) for always being there for me.

This handout is only the beginning of my journey.

Finally, I would like to leave the all remaining space in memory of late Omary Jumanne-my young brother.

                                                  Mohamed Jumanne

                                                  JANUARY 2017