sergiks

/**
 * Test to figure out combinations of at least two elements of provided array.
 *
 * by Sergei Sokolov, [email protected], 2015 April 27, St. Petersburg.
 * Fiddle: http://jsfiddle.net/sergiks/2ojgqxk1/
 */
function comb(a) {
    var l, cursor, mask, tail, out=[];
    l = a.length;
    if( l<2  ||  l>32) {