shithub: kwa

ref: 279f78a86cbff3f526fe1a1debd4d4f5766f96b0
dir: /test/t.randk/

{
	k = 2
	n = NF
	i = 1
	while ( i <= n ) {
		if ( rand() < k/n ) {
			print i
			k--
		}
		n--
		i++
	}
}