how many cubes are the same color as the leftmost item that is not purple?
return items ;return #1 that  is  leftmost ;return #2 besides purple items ;return cubes ;return color of #3 ;return colors of #4 ;return #4 where #5 is  the same as #6 ;return number of #7
['select', 'filter', 'discard', 'select', 'project', 'project', 'comparative', 'aggregate']