What are the names of the teachers and the courses they teach in ascending alphabetical order by the name of the teacher?
return teachers ;return courses that  #1 teach ;return the   names of #1 ;return the   names of #2 ;return #3 ,  #4 ;return #5 sorted by #3 in ascending alphabetical order
['select', 'project', 'project', 'project', 'union', 'sort']