The sisters of Aaron Green were Betty and Clara; the name of Aaron's girlfriend was Flora Brown and, Duane and Edwin were Flora’s brothers. Their occupations were as follows:

• Aaron was a doctor.
• Betty was a doctor.
• Clara was a lawyer.
• Duane was a doctor.
• Edwin was a lawyer.
• Flora was a lawyer.

One of the six killed one of the other five. Here are some clues to the murder.

1. If the killer and the victim were related, the killer was a man.
2. If the killer and the victim were not related, the killer was a doctor.
3. If the killer and the victim had the same occupation, the victim was a man.
4. If the killer and the victim had different occupations, the victim was a woman.
5. If the killer and the victim were of the same sex, the killer was a lawyer.
6. If the killer and victim were different sexes, the victim was a doctor.

Who was the killer? Who was the victim?