loop(int i=0;i<10;i++)
{
   f("hello");
}



See
   http://www.webber-labs.com/wp-content/uploads/2015/08/mpl-02.pdf#page=4

"the cat eats a dog"

<S> ==> <NP><V><NP>     // left derivation
    ==> <A><N><V><NP>
    ==> the<N><V><NP>
    ==> the cat<V><NP>
    ==> the cat eats<NP>
    ==> the cat eats<A><N>
    ==> the cat eats a<N>
    ==> the cat eats a dog

                       <S>            //  parse tree
                     /  |  \
                    /   |   \
                <NP>   <V>   <NP>
                / \     |     / \
               /   \  eats   /   \
             <A>  <N>      <A>   <N>
              |    |        |     |
             the  cat       a    dog