问如何在其他选择下拉列表中隐藏特定的选定选项

EN

angular.module('app', [])
  .controller('controller', function() {
    var self = this;
    self.mainList = [{
      name: 'Public'
    }, {
      name: 'Private'
    }, {
      name: 'Protected'
    }, {
      name: 'Super'
    }, {
      name: 'Awesome'
    }, ];
    self.lists = [
      [],
      []
    ];
    self.selections = [self.mainList[0], self.mainList[1]];
    self.buildList = function(which, other) {
      self.lists[which] = [];
      self.mainList.forEach(function(e) {
        if (e.name !== self.selections[other].name) {
          self.lists[which].push(e);
        }
      });
    };
    self.buildLists = function() {
      self.buildList(0, 1);
      self.buildList(1, 0);
    };
  });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="app" ng-controller="controller as c" ng-init="c.buildLists()">
  <label>First</label>
  <select ng-model="c.selections[0]" ng-change="c.buildLists()" 
          ng-options="o.name for o in c.lists[0]">
  </select>
  <label>Second</label>
  <select ng-model="c.selections[1]" ng-change="c.buildLists()" 
          ng-options="o.name for o in c.lists[1]">
  </select>
</div>