11458
Because the number of parameters required by a Volterra series grows rapidly with both the length of its memory and the order of its nonlinearity , methods for identifying these models from measurements of input / output data are limited to low - order systems with relatively short memories .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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