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// let a = 42
// let b = a
// b++
// console.log('a', a)
// console.log('b', b)

let a = [1, 2, 3]
let b = a
b.push(4)

let c = [1, 2, 3, 4]

console.log('a', a)
console.log('b', b)

console.log(a === b)
console.log(a === c)