No standard form categorical syllogism having two negative premises is valid. Some scientists are not magicians. Therefore some magicians are not astrologers. Fallacy of exclusive premises. No poets are managers.
Some artists are poets.
Therefore some artists are managers. Fallacy of drawing an affirmative conclusion from a negative premise. No valid standard-form categorical syllogism with a particular conclusion can have two universal premises. No unicorns are domestic animals. Therefore some unicorns are not domestic animals.