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'use strict';
var value = require('../../object/valid-value')
, aFrom = require('../from')
, toArray = require('../to-array')
, contains = require('./contains')
, byLength = require('./_compare-by-length')
, filter = Array.prototype.filter, push = Array.prototype.push;
module.exports = function (/*…lists*/) {
var lists, seen, result;
if (!arguments.length) return aFrom(this);
push.apply(lists = [this], arguments);
lists.forEach(value);
seen = [];
result = [];
lists.sort(byLength).forEach(function (list) {
result = result.filter(function (item) {
return !contains.call(list, item);
}).concat(filter.call(list, function (x) {
return !contains.call(seen, x);
}));
push.apply(seen, toArray(list));
});
return result;
};
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