user: Question: How many years was Lynn Muscarella the high school principal and Charlie Wiltse the superintendent?
Columns: ['Year', 'Superintendent', 'Middlesex Principal', 'Gorham Principal', 'Middle School Principal', 'High School Principal']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1999-2000', 'Charlie Wiltse', 'Cynthia Martone', 'Jackie Metz', 'Keith Eddinger', 'Dean Duffy']
SQL:

assistant: SELECT COUNT("Year") FROM "Table" WHERE "High School Principal" = 'Lynn Muscarella' AND "Superintendent" = 'Charlie Wiltse';