SCHEMA:
CREATE TABLE table_name_79 (nationality VARCHAR, previous_team VARCHAR, nba_years_ VARCHAR, a_ VARCHAR)
USER:
What is Nationality, when NBA years [a ] is "1", and when Previous Team is "Seattle Supersonics"?

QUERY:
SELECT nationality FROM table_name_79 WHERE nba_years_[a_] = "1" AND previous_team = "seattle supersonics"