Unsynchronized access to map from multiple goroutines

Determine what output will appear in the console, considering that multiple goroutines are writing values to a regular map simultaneously without any synchronization. Pay attention to the possible consequences of data races.

func main() {
    data := make(map[int]bool)
    for i := 0; i < 10; i++ {
        go func() {
            data[i] = true
        }()
    }

    time.Sleep(time.Second * 5)
    for k, v := range data {
        fmt.Println(k, v)
    }
}