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].

#1 return Sebastian Janikowski 
#2 return field goals of #1 
#3 return yards of #2 
#4 return longest of #3 
#5 return Rob Bironas 
#6 return field goals of #5 
#7 return yards of #6 
#8 return longest of #7 
#9 return difference of #4 and  #8
How many yards longer was Sebastian Janikowski's longest field goal than Rob Bironas' longest field goal?

#1 return towels 
#2 return #1 that are  solid gray 
#3 return stack of  #2 
#4 return number of #2 for each #3 
#5 return #3 where #4 is  at least two 
#6 return If #5 is  in  an image
If an image shows a stack of at least two solid gray towels.

#1 return balls 
#2 return sizes of #1 
#3 return materials that  #1 are made of 
#4 return #1 where  #2 are the  same  
#5 return #1 where  #3 are the  same  
#6 return #1 in  both  #4 and #5 
#7 return number of #6

How many balls are of the same size and made of the same material?