Which teacher teaches the most students? Give me the first name and last name of the teacher.
return teachers ;return students #1 teach ;return number of  #2 for each #1 ;return #1 where #3 is  highest ;return first name of #4 ;return last name of #4 ;return #5 ,  #6
['select', 'project', 'group', 'superlative', 'project', 'project', 'union']