Instruct: What is the entry for Upper index Kcal/ Nm 3 for the row with an entry that has a Lower index MJ/ Nm 3 larger than 47.91, for propylene, and an Upper index MJ/ Nm 3 larger than 77.04?
Output: SELECT SUM Upper index Kcal/ Nm 3 FROM table WHERE Lower index MJ/ Nm 3 > 47.91 AND Fuel gas = propylene AND Upper index MJ/ Nm 3 > 77.04