instruction:
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].
question:
question: If each image shows one gray truck equipped with a bright yellow snow plow and parked on snowy ground.
answer:
#1 return truck 
#2 return #1 that is gray 
#3 return snow plow 
#4 return #3 that is bright yellow 
#5 return #2 that has #4 
#6 return ground 
#7 return #6 that is snowy 
#8 return #5 that is parked on #7 
#9 return images 
#10 return the  number of  #8 for each  #9 
#11 return #9 where  #10 is equal to  one 
#12 return the  number of  #11 
#13 return the  number of  #9 
#14 return if  #12 is equal to  #13


question:
question: is the purple sphere in front of the blue cube?
answer:
#1 return the  purple sphere 
#2 return the  blue cube 
#3 return if  #1 is  in front of #2


question:
question: what movies did matthau and lemmon appear in together?
answer:

#1 return matthau 
#2 return movies of #1 
#3 return lemmon 
#4 return movies of #3 
#5 return movies in  both  #2 and #4