'use strict';

var value    = require('../../object/valid-value')
  , contains = require('./contains')
  , byLength = require('./_compare-by-length')

  , filter = Array.prototype.filter, push = Array.prototype.push
  , slice = Array.prototype.slice;

module.exports = function (/*…list*/) {
	var lists;
	if (!arguments.length) slice.call(this);
	push.apply(lists = [this], arguments);
	lists.forEach(value);
	lists.sort(byLength);
	return lists.reduce(function (a, b) {
		return filter.call(a, function (x) { return contains.call(b, x); });
	});
};