23235
Extensive statistical analyses are performed in order to identify the main sources of uncertainties which may occur when using : ( i ) different techniques / methods / approaches in the same / different laboratories , in various food samples , and ( ii ) to indicate the facts / conditions under which the biases between results may remain unidentified after applying statistical testing .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None