--- /dev/null
+'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); });
+ });
+};