How many steps will be required to complete the rearrangement?
Six
Input: 48 lamp zoo 19 72 yes cat van 25 all 78 53
Step I: all 48 lamp zoo 19 72 yes cat van 25 53 78
Step II: cat all 48 lamp zoo 19 yes van 25 53 78 72
Step III: lamp cat all 48 zoo 19 yes van 25 78 72 53
Step IV: van lamp cat all zoo 19 yes 25 78 72 53 48
Step V: yes van lamp cat all zoo 19 78 72 53 48 25
Step VI: zoo yes van lamp cat all 78 72 53 48 25 19
Thus, six steps will be required to complete the rearrangement.