If the left image shows one adult gorilla on all fours, and the right image shows one adult gorilla with a frowning face looking directly at the camera.
return gorilla  ;return #1 that is  an  adult  ;return all fours of  #2 ;return #2 on #3 ;return #4 in  the  left image ;return number of #5 ;return if  #6 is  equal to one  ;return face of  #2 ;return #2 where #8 is  frowning ;return #9 that is  looking directly at the  camera ;return #10 in  the  right image ;return number of #11 ;return if  #12 is  equal to one  ;return if  both  #7 and #13 are  true
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