If one soap dispenser has a flat bottom and can be set on a counter.
return soap dispensers ;return bottom of #1 ;return #1 where  #2 is flat ;return counter ;return #3 that can be set on #4 ;return number of  #5 ;return if  #6 is equal to  one
['select', 'project', 'comparative', 'select', 'filter', 'aggregate', 'boolean']