code: public Object get(String subscript) {
          if (!values.containsKey(subscript)) {
              throw new RuntimeException("Subscript not found");
          }
          
          return values.get(subscript);
      }
docs: Returns the subscripted vector value. A runtime exception is thrown if no vector value exists
  at the specified subscript.
  
  @param subscript The subscript specifier.
  @return The vector value.