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Somasundaram SubramanianSomasundaram Subramanian 

remove duplicate

am new to delopment  how to rmeove duplicate in the list
SwethaSwetha (Salesforce Developers) 
Can you share more background on the issue and share code related to list
zUsageToCreateT9 so the community can suggest better?

Somasundaram SubramanianSomasundaram Subramanian
zUsageToCreateT9 = new List < JSONGenerator >(); zUsageToCreateT9.add(usage.buildZuoraUsageT97()); if (prebillUsage != null){ zUsageToCreateT9.add(prebillUsage.buildZuoraUsageT97()) i feel some where duplicate value gets added and like to remove duplicate value in the list thanks