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// import the necessary modules'use strict';
const mongoose = require('../../lib');const Schema = mongoose.Schema;
// create an export function to encapsulate the model creationmodule.exports = function() {  // define schema  const PersonSchema = new Schema({    name: String,    age: Number,    birthday: Date,    gender: String,    likes: [String]  });  mongoose.model('Person', PersonSchema);};