Output all combinations of character variables a$,$ b$,$ and c$,$ in the order shown below. After the final output, end with a newline. If a $=\text{'}$x$\text{'},$ b $=\text{'}$y$\text{'},$ and c $=\text{'}$z$\text{'},$ then the output is:

xyz xzy yxz yzx zxy zyx