Permutation 1: 1 2 3
Permutation 2: 1 3 2
Permutation 3: 2 1 3
Permutation 4: 2 3 1
Permutation 5: 3 1 2 
Permutation 6: 3 2 1

ALGORITHM
print permutation 1
print permutation 2
...
print permutation 6