If one safety pin is open and one is closed.
return safety pins ;return #1 that are open ;return #1 that are closed ;return number of  #2 ;return number of  #3 ;return if  #4 is equal to  one ;return if  #5 is equal to  one ;return if  both  #6 and #7 are true
['select', 'filter', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']