Who are the greatest hockey players of all time?
The greatest hockey players of all time include Wayne Gretzky, Mario Lemieux, Bobby Orr, and Gordie Howe.
### Instruction: Who are the greatest hockey players of all time?
### Context: 
### Answer: The greatest hockey players of all time include Wayne Gretzky, Mario Lemieux, Bobby Orr, and Gordie Howe.</s>