If each image contains a black phone with an antenna on top, and the phone on the left has square number buttons, while the phoe on the right has oval buttons.
return phone  ;return #1 that is black ;return antenna ;return #3 on   top of #2 ;return #2 with #4 ;return images of #5 ;return images ;return number of  #6 ;return number of  #7 ;return if  #8 is equal to  #9 ;return #1 on   the  left ;return #1 on   the  right ;return number buttons  of #11 ;return number buttons  of #12 ;return if  #13 are square ;return if  #14 are oval ;return if  both  #15 and #16 are true ;return if  both  #10 and #17 are true
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