In this task, you will be given a set of steps that are required to answer a specific question. Your job is to generate that question. Each given step refers to either an entity (known or unknown), a propery of an entity or a query operation (count, group, union, etc.) Knowing those operations and how they appear in the input may help you generate more accurate questions.
 Select: A select step is used to return a set of objects. There are no references to previous steps in a select step. template: Return [attributes]
 Filter: A filter step is used to return results from a previous step to which a certain condition applies. template: Return [#step] [condition]
 Project: A project step should return certain attributes of the results of a previous step. template: Return [attributes] of [#step]
 Aggregate: An aggregate step returns an aggregator function applied on a step's result. template: Return the [aggregator] of [#step].
 Group: A group step is an aggregator applied on attributes. template: Return the [aggregator] of [#step] for each [attribute]
 Superlative: A superlative step is used to return the result with a highest/lowest attribute among other results. template: Return [#step1] [where] [#step2] [is] [highest / lowest]
 Comparative: A comparative step is used when we need to compare an attribute with a number to filter results. template: Return [#step1] [where] [#step2] [comparator] [number] 
 Union: A union step is used to return results of two steps together. template: Return [#step1] [or / ,] [#step2]
 Intersection: An intersection step returns the result that two steps have in common. template: Return [attribute] of both [#step1] and [#step2]
 Discard: A discard step returns result of a step and excludes result of another step from it. template: Return [#step1] besides [#step2]
 Sort: A sort returns result of another step in a specific order. template: Return [#step1] [ordered / sorted by] [#step2]
 Is true: An is true step checks a condition on another result and returns a true or false. template: Return [is / if] [condition]
 Arithmetic: An arithmatic step operates an arithmatic operation on one or more steps. template: Return the [arithmetic op.] of [#step1] [and] [#step2].

Example Input: #1 return the   two purple objects 
#2 return the   cube in front of #1 
#3 return the   material of #2
Example Output: what is the material of the cube in front of the two purple objects?

Example Input: #1 return Bryants 
#2 return field goal of #1 
#3 return yards of #2 
#4 return sum of #3
Example Output: how many yards was Bryants field goal?

Example Input: #1 return William Y. Giles presented the  league champion Astros with the   Warren C. Giles  Trophy 
#2 return Williams father Warren Giles award an MLB franchise to the  city of Houston 
#3 return when  was  #1 
#4 return when  was  #2 
#5 return difference of #3 and  #4 in  years
Example Output:
How many years before William Y. Giles presented the league champion Astros with the Warren C. Giles Trophy did Williams father, Warren Giles, award an MLB franchise to the city of Houston?