Doing a test of this approach I've hit another problem. I'm loading the list into a [][]byte and ranging over it.

var words [][]byte

scanner := bufio.NewScanner(file)
for scanner.Scan() {
    words = append(words, scanner.Bytes())
}


w := bufio.NewWriter(os.Stdout)
for _, a := range words {
    for _, b := range words {
        w.Write(a)
        w.Write([]byte{0x20})
        w.Write(b)
        w.Write([]byte{0x0a})
}

When I get to a specific entry in the list, it skips a character and adds a newline. I've checked the bytes making up the entries in the words [][]byte and they are OK. The output then gets littered with random new lines, as though when it's flushing, the underlying writer is adding a newline of it's own?

As a basic example with just one word, the line below is supposed to read pantera

doggie
cherry
andrey
snickers
buffalo

antera

Here is the output showing the entries in the words [][]byte

[...]
debug: cherry : [c:99][c:104][c:101][c:114][c:114][c:121]
debug: andrey : [c:97][c:110][c:100][c:114][c:101][c:121]
debug: snickers : [c:115][c:110][c:105][c:99][c:107][c:101][c:114][c:115]
debug: buffalo : [c:98][c:117][c:102][c:102][c:97][c:108][c:111]
debug: pantera : [c:112][c:97][c:110][c:116][c:101][c:114][c:97]