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Then , an intimate almost popular melancholic song arises out of the pitch sequence of the beginning , with which the work fades away . Furthermore , the known DNA sequence of a frog is nowhere near complete . A program from a source language is translated ( via a semantic definition ) to trees of combinators ; the tree is simplified via associative and distributive laws ) to a linear , assembly-language-like format ; the `` compiler writer 's virtual machine '' operates by simulating a reduction sequence of the simplified tree . ( It was used in the introduction sequence of the X-FILES , for example . Note how long the persistence lasts ( these were persistence artefacts from a previous part of a tile 9-point jitter sequence of the Open Cluster field above .