text: // before
  db.coll.insert({"_id": 1, name: "Vasya"});
  db.coll.insert({"_id": 2, name: "Petya"});
  db.coll.insert({"_id": 3, name: "Lyusya"});
  // command
  db.coll.find().comment("hello")
  // clear
  db.coll.drop();