‘D @ G’ means ‘D is the father of G’,
‘D # G’ means ‘D is the daughter of G’,
‘D * G’ means ‘D is the mother of G’, and
‘D - G’ means ‘D is the husband of G’.
If A - Q * B @ R, how is A related to R?

A

Father

B

Husband

C

Son

D

Father’s father