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db.alura.find({
    "notas": {
        $gt:4 //Greater than
      }
})

db.alura.findOne({ // Return only one element
    "notas": {
        $gt:5 //Greater than
      }
})

db.alura.findOne({ // Return only one element
    "notas": {
        $gt:5 //Greater than
      }
})