<div id="app">
  <v-app>
    <v-container>
      <v-layout>
        <v-flex>
          <h1 class='grey'>Single</h1>
          <h1 v-for='(number, index) in numbers' :key="index">{{ number }}</h1>
        </v-flex>
        <v-flex>
          <h1 class='grey'>Double</h1>
          <h1 v-for='double in doubles'>{{ double }}</h1>
        </v-flex>
        <v-flex>
          <h1 class='grey'>Triple</h1>
          <h1 v-for='triple in triples'>{{ triple }}</h1>
        </v-flex>
      </v-layout>
    </v-container>
  </v-app>
</div>