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BACKGROUND : The risk / benefit ratio of warfarin therapy changes in the over 75s , when haemorrhagic side - effects become more common .
 adverse effect: haemorrhagic side - effects, warfarin
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: haemorrhagic side - effects, warfarin