shithub: kwa

ref: e6dff2afe66a7aea90440fe000f6b2f7513f1888
dir: /test/t.randk/

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