How many of the scientists and physicians lived to be over 70 years old?
return scientists ;return physicians ;return #1 that lived to be over 70 years old ;return #2 that lived to besides  over 70 years old ;return number of  #3 ;return number of  #4 ;return sum of #5 and  #6
['select', 'select', 'filter', 'discard', 'aggregate', 'aggregate', 'arithmetic']