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<link rel=“import” href=“../../polymer/polymer.html”> <link rel=“import” href=“../../iron-validator-behavior/iron-validator-behavior.html”>

<script>

Polymer({

  is: 'letters-only',

  behaviors: [
    Polymer.IronValidatorBehavior
  ],

  validate: function(value) {
    return !value || value.match(/^[a-zA-Z]*$/) !== null;
  }

});

</script>