Многомерный объект JS

var text = 'student study english\nstudent study math\nstudent study Music\n' 
  + 'teacher teaches Ecology\nteacher teaches Math\nteacher teaches Physics'; 
 
var data = text.split('\n').reduce(function(data, item) { 
  var parts = item.trim().split(/ +/); 
  if (3 <= parts.length) { 
    var target = parts.shift() 
      , action = parts.shift(); 
    if (!data[target]) { 
      data[target] = {}; 
    } 
    if (!data[target][action]) { 
      data[target][action] = []; 
    } 
    data[target][action].push(parts.join(' ')); 
  } 
  return data; 
}, {}); 
console.log(data);