old_contents: import React from 'react'
  import { Route } from 'react-router'
  import SearchMain from './containers/SearchMain'
  
  export default (
    <Route path="/"
           component={SearchMain} />
  )
  
new_contents: import React from 'react'
  import { Route, IndexRoute } from 'react-router'
  import SearchMain from './containers/SearchMain'
  import List from './containers/List'
  
  export default (
    <Route path="/">
      <IndexRoute component={SearchMain} />
      <Route path="list" component={List} />
    </Route>
  )
  
subject: index route and lists