A woman competes in an equestrian competition atop a white horse .
A woman entered her dog in the dog competition .
A woman competes in an equestrian competition atop a white horse.
A woman entered her dog in the dog competition.
A woman competing in an equestrian competition cannot be involved in a dog competition at the same time.
A woman competing in an equestrian competition can not be involved in a dog competition at the same time .