clear(freq)
	for _, c := range text {
		freq[c]++
	}
	return freq
}

func freq_32(text []int32, freq, bucket []int32) []int32 {
	if freq != nil && freq[0] >= 0 {
		return freq // already computed
	}
	if freq == nil {
		freq = bucket
	}

	clear(freq)
	for _, c := range text {
		freq[c]++
	}
	return freq
}