14419
Observations in our patient suggest that the leukoencephalopathy that developed in previously reported patients who received 5-fluorouracil and levamisole may have been caused at least partly by levamisole .
 adverse effect: leukoencephalopathy, 5-fluorouracil; adverse effect: leukoencephalopathy, levamisole; adverse effect: leukoencephalopathy, levamisole
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 adverse effect: leukoencephalopathy, 5-fluorouracil; adverse effect: leukoencephalopathy, levamisole; adverse effect: leukoencephalopathy, levamisole