Lena was asked by Eva to create a small utility for their internal scheduling tool to help assign rotating groups for peer reviews. The tool needs to generate every possible unique group of a specific size from the total pool of available team members. For instance, if there are four staff members and the team needs to find all possible pairs, the utility should list every distinct duo, such as members 1 and 2 or 2 and 3, until every combination is accounted for. Mark noted that the order within the group doesn't matter, so long as every unique set is discovered.