If each image contains only one lock, and each lock has a silver loop at the top.
return lock  ;return images ;return the  number of  #1 for each  #2 ;return #2 where  #3 is equal to  one ;return the  number of  #1 ;return the  number of  #4 ;return if  #5 is equal to  #6 ;return loop ;return #8 that is silver ;return top of #1 ;return #1 that has #9 on #10 ;return the  number of  #1 ;return the  number of  #11 ;return if  #12 is equal to  #13 ;return if  both  #7 and #14 is true
['select', 'select', 'group', 'comparative', 'aggregate', 'aggregate', 'boolean', 'select', 'filter', 'project', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean']