No symbol repeats.
Read rows and columns together; each answer satisfies three structures.

Every row, column and framed quarter must contain each of the four assay seals exactly once.
Sit at the ledger deskTap an empty seal to cycle its mark. Complete each 4×4 folio without repeating a symbol in any row, column or quarter.
Read rows and columns together; each answer satisfies three structures.
The page behaves like a working assay book, not a casino board.
No gambling, currency, payment, registration or prize is involved.