If there is at least one unworn knee pad to the right of a model's legs.
return knee pad ;return #1 that is unworn ;return model ;return leg of #3 ;return #2 that is to  the  right of #4 ;return the  number of  #5 ;return if  #6 is at least one
['select', 'filter', 'select', 'project', 'filter', 'aggregate', 'boolean']