 All he had to do was to repair the sky.
He laughed to himself as he thought about how ridiculously difficult a task he had been given in repairing the sky, and that laughter comforted him slightly.
mnli hypothesis: He laughed to himself as he thought about how ridiculously difficult a task he had been given in repairing the sky, and that laughter comforted him slightly. premise:  All he had to do was to repair the sky.