In this task you will break down a question into the basic steps required to answer it.
 A question decomposition is a numbered list of operations that must be performed to answer the original question. Imagine explaining your question to a friendly droid by listing each action it should take in order for the question to be answered. Each step in our decomposition should refer to either an entity (known or unknown), a propery of an entity or a query operation (count, group, union, etc.)
 Here are the list of step templates and their description:
 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].

[Q]: question: Find the payment method that is used the most often in all the invoices. Give me its code.
[A]: #1 return invoices 
#2 return payment methods of #1 
#3 return number of  #1 for each #2 
#4 return #2 where #3 is highest 
#5 return code of #4


[Q]: question: What are the first names of all history professors who do not teach?
[A]: #1 return history professors 
#2 return #1 that do teach 
#3 return #1 besides  #2 
#4 return first names of #3


[Q]: question: How many years after Matthias succeeded as King of Hungary did he and Frederick III/V settle their rivalry with the Treaty of Wiener Neustadt?
[A]:
#1 return Matthias succeeded as King of Hungary 
#2 return Matthias and  Frederick III/V settle their rivalry with the  Treaty of Wiener Neustadt 
#3 return year of #1 
#4 return year of #2 
#5 return the  difference of #4 and  #3