AngularJS uses ng repeat to report errors [ngRepeat: dupes]

AngularJS uses ng-repeat to report errors

[ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to specify uniq

ng-repeat error report

   
<div ng-init="words = [' Colleges and universities ',' Colleges and universities ',' Colleges and universities ']" ng-repeat="word in words"> 
  {{word}} 
</div> 

[ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys

Discovery is caused by duplication of the same content, and solutions

<div ng-init="words = [' Colleges and universities ',' Colleges and universities ',' Colleges and universities ']" ng-repeat="word in words track by $index"> 
  {{word}} 
</div> 

Add after ng-repeat

track by $index 

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