303417
A signal travelling along an electrical transmission line will be partly , or wholly , reflected back in the opposite direction when the travelling signal encounters a discontinuity in the transmission parameters of the line , or at the far end of the line if the line is not correctly terminated in its characteristic impedance .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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