To me, it is the first time to know about Rollyo. It is quite useful tool to build up a unique search. However, it takes time to choose what you want to include in your search engine. Besides, you need to understand well about the website you selected in your search. Otherwise, it just like you select several website and put into a virtual searching engine. In my opinion, it is merely put a infant searching engine for what you selected.
The following is my searching engine
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