If at least one big horn sheep is looking down over the edge of a tall cliff.
return big horn sheep ;return cliff ;return #2 that is tall ;return the  edge of #3 ;return #1 looking down over #4 ;return number of  #5 ;return if  #6 is at least one
['select', 'select', 'filter', 'project', 'filter', 'aggregate', 'boolean']