```
func findRepeatedDnaSequences(s string) []string {
var codes ['T' + 1]uint32
codes['A'] = 0
codes['C'] = 1
codes['G'] = 2
codes['T'] = 3
var repeated []string
seen := make([]byte, 1<<20)
var cur uint32
for i := 0; i < len(s); i++ {
cur = ((cur << 2) & 0xFFFFF) | codes[s[i]]
if i < 9 {
continue
}
if seen[cur] == 0 {
seen[cur] = 1
} else if seen[cur] == 1 {
repeated = append(repeated, s[i-9:i+1])
seen[cur] = 2
}
}
return repeated
}
```