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In this context , a _ foreign language interface _ ( FLI ) is a sublanguage of a programming language that allows programs written in that p.l . The sources range back to 1996 and perceptions may rely on experiences made before that time . Users can select a single SE step and see all the LLKR lessons and resources associated with that step . But there is a lot of physics and mathematics hidden behind that layman 's facade , and it has to be dealt with in order to understand the real nature of the tidal relationship between Earth and the moon . Those looking to improve their lives can get too caught up in trying to be perfect and in judging others based on that , too .