
*** Yes
> > 
*** Yes
> 
*** Yes
> 
*** Yes
> 
*** Yes
> 
*** Yes
> 
*** Yes
> bike
*** Yes
A = bike.
--1> truck
*** Yes
A = bike, B = truck.
----2> 
*** No
----2> bike
*** Yes
A = bike, B = truck, D = bike.
------3> bike
*** Yes
A = bike, B = truck, D = bike, E = bike.
--------4> > 
