code: function hasSiblings(tile, tiles) {
      var siblings = getSiblings(tile);
      for (var i = 0; i < siblings.length; i++) {
          if (!hasTile(tiles, siblings[i])) return false;
      }
      return true;
  }
docs: Get the 3 sibling tiles for a tile
  
  @name getSiblings
  @param {Array<number>} tile
  @returns {Array<Array<number>>} tiles
  @example
  var tiles = getSiblings([5, 10, 10])
  //=tiles