If both images show a pair of grey sneakers that aren't currently worn by anyone.
return pair of sneakers ;return #1 that are grey ;return #2 that are currently worn ;return #2 besides  #3 ;return images ;return number of  #4 for each  #5 ;return #5 where  #6 is at least one ;return number of  #7 ;return if  #8 is equal to  two
['select', 'filter', 'filter', 'discard', 'select', 'group', 'comparative', 'aggregate', 'boolean']