If there is exactly one hand visible in one of the images
return images ;return hands in  #1 ;return #2 that are  visible ;return number of #3 for each #1 ;return #1 where #4 is  equal to one  ;return number of #5 ;return if  #6 is  equal to one
['select', 'project', 'filter', 'group', 'comparative', 'aggregate', 'boolean']