If one image shows one straight, continuous set of stairs while the other shows at least one landing or turn.
return one   image ;return set of stairs in  #1 ;return #2 that is continuous ;return #3 that is straight ;return number of  #4 ;return if  #5 is equal to  one   ;return other image ;return landing in  #7 ;return turn in  #7 ;return #8 , #9 ;return number of  #10 ;return if  #11 is at least one   ;return if  both  #6 and #12 are true
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