user: Question: What position had notes of 20km and a year earlier than 2002?
Columns: ['Year', 'Competition', 'Venue', 'Position', 'Notes']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1999.0, 'World Race Walking Cup', 'Mézidon-Canon , France', '55th', '20km']
SQL:

assistant: SELECT "Position" FROM "Table" WHERE "Notes" = '20km' AND "Year" < 2002.0;