Find the first names of professors who are not playing Canoeing or Kayaking.
return professors ;return #1 who  are playing Canoeing ;return #1 who  are playing Kayaking ;return #1 besides  #2 ;return #4 besides  #3 ;return first names of #5
['select', 'filter', 'filter', 'discard', 'discard', 'project']