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I recommend Allen’s mp3s and use them for nocturnal programming. Also, I have learned a lot of practical shortcuts from the FRA “problem series” videos. However, in my opinion, Allen’s customer service can be better. They will not allow the direct exchange of one service for a similar, equally-priced service.
Nonetheless, after I receive reliable intel on which specific videos Olinto will be conducting for 7city, I will ordering those in level 1 & 2.