“…[1,6,14,22,28,39], unlearning is a process of "discarding" or reducing, eliminating, clearing, releasing obsolete aspect. Some others have expressed unlearning as a process of "discarding obsolete aspect for making new way" (for example, [7][8][9]13,19,23,40,41] have stated unlearning is a process of "acknowledgement of obsolete aspect, discarding of it to accommodate new aspect" (e.g. [25,42].…”