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].

Input: Consider Input: #1 return flights 
#2 return Airport #1 arrive at 
#3 return #1 where #2 is  APG 
#4 return flight numbers of  #3

Output: What are flight numbers of flights arriving at Airport "APG"?


Input: Consider Input: #1 return the  Mongols 
#2 return the  Shan 
#3 return if #1 leave 
#4 return if #2 leave 
#5 return which is false of #3 ,  #4

Output: Which group did not leave, Mongols or the Shan?


Input: Consider Input: #1 return tv 
#2 return #1 that is flat-screen 
#3 return #2 that is large 
#4 return bookshelves 
#5 return #4 that are white 
#6 return #5 that are vertical 
#7 return rooms 
#8 return #3 that is flanked by #6 
#9 return #8 that is in  #7 
#10 return number of  #9 for each  #7 
#11 return #7 where  #10 is at least one 
#12 return number of  #11 
#13 return if  #12 is equal to  one


Output: If a large flat-screen tv is flanked by vertical white bookshelves in one of the rooms.