Unique collection in Laravel

I need to find of unique value. So I tried bellow code. It is through undefined variable error.

Controller: $employee = Employee::all(); Return view ('page', compact(employee));

Page view: $uniqueEmpLoc = $employee->unique('location')->values()->list('location')->toArray(); @Foreach($uniqueEmpLoc as $empLoc) { {{ $empLoc }} } @endforeach

But I got an uniqueEmpLoc is undefined error. I'm using LARAVEL 5.1. Please help me to solve this problem.

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