func shuffle(a []string) {
	for i := range a {
		j := rand.Intn(i + 1)
		a[i], a[j] = a[j], a[i]
	}
}
// shuffle shuffles the given slice.
shuffle shuffles the given slice.
// shuffle shuffles the given slice .
func shuffle(a []string) {
	for i := range a {
		j := rand.Intn(i + 1)
		a[i], a[j] = a[j], a[i]
	}
}
func shuffle ( a [ ] string ) { for i := range a { j := rand . Intn ( i + 1 ) a [ i ] , a [ j ] = a [ j ] , a [ i ] } }
shuffle shuffles the given slice.
shuffle shuffles the given slice .