If there are people looking at and reading books
return people ;return books ;return #1 looking at #2 ;return #1 reading #2 ;return number of #3 ;return number of #4 ;return if  #5 is  at least one ;return if  #6 is  at least one ;return if  both  #7 and #8 are  true
['select', 'select', 'filter', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']