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So, if you'd included some technical matters, that could have changed the result. Sorry about that, rules are rules and as moderators, we are bound to apply them. Also be careful about the topic of the lesson. Instead of slicing it unnecessarily, try to collect same concepts under a general topic. By that way, you can teach many concepts on the same topic. I'm awaiting your next contributions, good luck.

No need to excuse. I knew the rules but for beginning there is no choice to explain software itself. I do my best to write more informative posts. Thank you