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 Description  
 Fibonacci Sequence:  The sequence 1, 1, 2, 3, 5, 8, 13, 21, ..., where each term is the sum of the two preceeding terms.
If we denote the nth term by fn, then by the definition fn+1 = fn + fn-1. The 0th term is accepted as 1. By our rule one can produce all the terms in the sequence.