**6. Acknowledgement**

After thanking Allah almighty for giving the authors the stimulus required to complete this work, the first author would like to thank her students for their valuable inquiries during a summer course on ANNs that she gave. Their eagerness to understand, queries and continuous criticisms helped her a lot to better formulate her thoughts and served as a valuable encouragement, especially during the early part of this work. It is true that, at many occasions, we learn from our students even more than we teach them! The second author acknowledges the support of EJUST.
