If exactly two kneepads are modeled on human legs, both of the pads black with a logo, but different designs.
return kneepads ;return #1 that are black ;return logo ;return #2 with #3 ;return designs of #4 ;return #4 where  #5 are different ;return human ;return legs of #7 ;return #1 modeled on #8 ;return #6 modeled on #8 ;return number of  #9 ;return number of  #10 ;return if  #11 is equal to  two ;return if  #12 is equal to  two ;return if  both  #13 and #14 are true
['select', 'filter', 'select', 'filter', 'project', 'comparative', 'select', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']