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Note (21 October 2020): I made all the videos, already uploaded in this channel, before 6 to 7 years ago without having any knowledge of video making. The videos were captured and stored in my drive for my own uses. Then, oneday, I came to know about YouTube and upload those videos. Anyway, the time when I made these videos, I was so weak in English speaking as English is not my mother tongue. Therefore, in all videos, my English was so poor. I am extremely sorry for my horrible English.