In which undefeated season did Benfica win the Primeira Liga under Duarte Borges Coutinho's presidency?
1970-71
1971-72
1972-73
1973-74
Answer
During Duarte Borges Coutinho's presidency, Benfica won the Primeira Liga title in the 1972-73 season without suffering a single defeat. This remarkable achievement further solidified the club's dominance in Portuguese football.
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