 
 <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. <ibo> Mona sonyere n'òtù 9, ya mere o jiri mmadụ 9 * 4 = 36 kpọọ egwu. O jikọtara ya na mmadụ 2+1=3 ugboro abụọ. N'ihi ya, ya na mmadụ iri atọ na isii - atọ = mmadụ iri atọ na atọ ndị na - eme egwuregwu n'otu ngwụcha izu ahụ. Azịza ikpeazụ ya bụ: 33. 