laravel collection find duplicates

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1// Retrieve the first task
2$task = Task::first();
3
4$newTask = $task->replicate();
5$newTask->project_id = 16; // the new project_id
6$newTask->save();

1$users = Users::all();
2$usersUnique = $users->unique('id');
3$usersDupes = $users->diff($usersUnique);
4
5dd($users, $usersUnique, $usersDupes);

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