text: const Graph = require('./lib-es6/graph');
  const Queue = require('./lib-es6/queue');
  const BinarySearchTree = require('./lib-es6/tree');
  const Search = require('./lib-es6/search');
  const Sorting = require('./lib-es6/sorting');
  
  module.exports = {
    Graph,
    Queue,
    BinarySearchTree,
    Search,
    Sorting
  };
  