 <translate> Mona joined 9 groups, so she played with 9 * 4 = 36 people. She grouped with 2 + 1 = 3 people twice. Thus, she played with 36 - 3 = 33 unique players that weekend. The final answer: 33. <yor> Mona darapọ̀ mọ́ àwọn ẹgbẹ́ mẹ́sàn-án, nítorí náà ó bá àwọn ènìyàn mẹ́sàn-án * mẹ́rin = mẹ́rìndínlógójì ṣeré. Ó kó àwọn èèyàn méjì jọ, 2+1=3 lẹ́ẹ̀mejì. Nípa bẹ́ẹ̀, ó bá àwọn òṣèré méjìlélọ́gbọ̀n - mẹ́ta = mẹ́tàlélọ́gbọ̀n gbá gẹ́ẹ́ lópin ọ̀sẹ̀ yẹn. Ìdáhùn wọn ni pé: 33. 