Alexa Keywords tool structure? (100$)

Alexa Keywords tool structure? (100$) Hello! Thank you for having interest in this topic. I have looked around how keyword tools exist and service in these days. Mostly by Amazon's Alexa Keyword tool or Google's adwards. As you see the link in below, there are many keywords tool that showing list of keywords. [login to view URL] I have a few question about it. In fact, I am planning to make my own tools such. but wondering about a few things before proceeding forward. And one thing I get to notice is, They are showing these keywords only to promote it, they simply don't show entire lists of the keywords they've got. This is the part I'm curious about more. I wish you know an original structure of these tools and how it works so you could help me find an answer below questions , if you know, kindly :) Question 1. As you see in the link, They have lists of keywords. Do you know how do they originally derive such keywords? and probably after-process it before listing on their service. = How do they derive such keywords? Question 2. When you see its service, You can also see that They often have this 'related rate' between keywords. and show how much related it is between. Do you know how they could do such things? Question 3. Is it possible to establish such keyword digging and decoing system as personal use ? by progamming way of course. Question 4. If you could answer yes to Question3, Estimated expanses to maintain such system ? (for running constant crawl / scraper bots 24/7) Essential Note 1. Please apply only when you have very exact answer for it. You should not make it up by yourself and pretend as if you know the logic. I'm very sure there's a standard way to dig up keywords lists in Online environment and I'm looking for someone who "Actually" Know about such things. :) Thank you for reading! Have a good day and bid me if you think you can build one. Anytime ! And I am willing to respond very quickly to explain more what I exactly need. also, if you can really make it out well this time in this project, I will promise to carry out further projects with you. Thanks alot.