user: Question: What is the highest K 2 O, when Na 2 O is greater than 1.87, when Fe 2 O 3 is greater than 0.07, when Objects is ritual disk, and when Al 2 O 3 is less than 0.62?
Columns: ['Objects', 'Date', 'SiO 2', 'Al 2 O 3', 'Fe 2 O 3', 'K 2 O', 'Na 2 O']
Types: ['text', 'text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Eye bead', '4th to 3rd centuries BC', 55.0, 2.13, 0.62, 4.05, 7.53]
SQL:

assistant: SELECT MAX("K 2 O") FROM "Table" WHERE "Na 2 O" > 1.87 AND "Fe 2 O 3" > 0.07 AND "Objects" = 'ritual disk' AND "Al 2 O 3" < 0.62;