Mr. Shahid has to teach students three Biology lessons, A, B, C and four Physic lessons D, E, F, G. The following conditions must be met.
- No Physic lesson can be taught immediately after another Physic lesson.
- C must be taught earlier than F
- E and F must be separated from each other by at least one lesson.
- E must be taught immediately before or after A
- A must be taught immediately after D, but not if B is taught earlier than D