You are a helpful assistant. The assistant first thinks about the reasoning process in the mind and then provides the user with the answer. The reasoning process and answer must be formatted exactly as follows:
<think>
[your reasoning process here]
</think>
<answer>
[your answer here]
</answer>
You can choose to imitate the reasoning process of relevant algorithms or explore an appropriate solution on your own. DO NOT use code, and remember to focus on the logical flow.
system
Your task is to solve the Minimum Vertex Cover problem in the given social network. In this network, each node represents a user, and each edge represents a friendship connection. You need to identify the smallest subset of users such that every friendship connection has at least one user from this subset.

**Problem to Solve**

- Users in the network: Anna Moore, Anthony Smith, Kathryn Cardenas, Sandra Parker, Douglas Whitaker, Maria Perry, Colin Thompson, Mark Turner, Tina Brown, Nicole Dillon, Jessica Mccann, Robert Nichols, Jay Cruz, Paul Estes, Kelly Maddox, Carolyn Walker, Matthew Allen, Dominique Allen, James Simmons PhD, Kenneth Pham.
- Fiendship connections: Anna Moore and Mark Turner, Anthony Smith and Mark Turner, Kathryn Cardenas and Mark Turner, Kathryn Cardenas and Sandra Parker, Sandra Parker and Mark Turner, Douglas Whitaker and Mark Turner, Maria Perry and Mark Turner, Colin Thompson and Mark Turner, Mark Turner and Nicole Dillon, Mark Turner and James Simmons PhD, Mark Turner and Kelly Maddox, Mark Turner and Robert Nichols, Mark Turner and Jessica Mccann, Mark Turner and Dominique Allen, Mark Turner and Carolyn Walker, Mark Turner and Matthew Allen, Mark Turner and Kenneth Pham, Mark Turner and Tina Brown, Mark Turner and Jay Cruz, Mark Turner and Paul Estes, James Simmons PhD and Kenneth Pham.
Identify the Minimum Vertex Cover of this network and present your answer in the following format: [UserA, UserB, UserC, UserD, ...].
user
{"directed": false, "multigraph": false, "graph": {}, "nodes": [{"name": "Anna Moore", "id": 1217927}, {"name": "Anthony Smith", "id": 906381}, {"name": "Kathryn Cardenas", "id": 1697168}, {"name": "Sandra Parker", "id": 1554834}, {"name": "Douglas Whitaker", "id": 1036181}, {"name": "Maria Perry", "id": 917661}, {"name": "Colin Thompson", "id": 1255591}, {"name": "Mark Turner", "id": 1114536}, {"name": "Tina Brown", "id": 1262251}, {"name": "Nicole Dillon", "id": 791343}, {"name": "Jessica Mccann", "id": 940335}, {"name": "Robert Nichols", "id": 902965}, {"name": "Jay Cruz", "id": 1200859}, {"name": "Paul Estes", "id": 1305440}, {"name": "Kelly Maddox", "id": 869731}, {"name": "Carolyn Walker", "id": 1052140}, {"name": "Matthew Allen", "id": 1076339}, {"name": "Dominique Allen", "id": 1004539}, {"name": "James Simmons PhD", "id": 809852}, {"name": "Kenneth Pham", "id": 1113725}], "links": [{"source": 1217927, "target": 1114536}, {"source": 906381, "target": 1114536}, {"source": 1697168, "target": 1114536}, {"source": 1697168, "target": 1554834}, {"source": 1554834, "target": 1114536}, {"source": 1036181, "target": 1114536}, {"source": 917661, "target": 1114536}, {"source": 1255591, "target": 1114536}, {"source": 1114536, "target": 791343}, {"source": 1114536, "target": 809852}, {"source": 1114536, "target": 869731}, {"source": 1114536, "target": 902965}, {"source": 1114536, "target": 940335}, {"source": 1114536, "target": 1004539}, {"source": 1114536, "target": 1052140}, {"source": 1114536, "target": 1076339}, {"source": 1114536, "target": 1113725}, {"source": 1114536, "target": 1262251}, {"source": 1114536, "target": 1200859}, {"source": 1114536, "target": 1305440}, {"source": 809852, "target": 1113725}]}
Your task is to solve the Minimum Vertex Cover problem in the given social network. In this network, each node represents a user, and each edge represents a friendship connection. You need to identify the smallest subset of users such that every friendship connection has at least one user from this subset.

**Problem to Solve**

- Users in the network: Anna Moore, Anthony Smith, Kathryn Cardenas, Sandra Parker, Douglas Whitaker, Maria Perry, Colin Thompson, Mark Turner, Tina Brown, Nicole Dillon, Jessica Mccann, Robert Nichols, Jay Cruz, Paul Estes, Kelly Maddox, Carolyn Walker, Matthew Allen, Dominique Allen, James Simmons PhD, Kenneth Pham.
- Fiendship connections: Anna Moore and Mark Turner, Anthony Smith and Mark Turner, Kathryn Cardenas and Mark Turner, Kathryn Cardenas and Sandra Parker, Sandra Parker and Mark Turner, Douglas Whitaker and Mark Turner, Maria Perry and Mark Turner, Colin Thompson and Mark Turner, Mark Turner and Nicole Dillon, Mark Turner and James Simmons PhD, Mark Turner and Kelly Maddox, Mark Turner and Robert Nichols, Mark Turner and Jessica Mccann, Mark Turner and Dominique Allen, Mark Turner and Carolyn Walker, Mark Turner and Matthew Allen, Mark Turner and Kenneth Pham, Mark Turner and Tina Brown, Mark Turner and Jay Cruz, Mark Turner and Paul Estes, James Simmons PhD and Kenneth Pham.
Identify the Minimum Vertex Cover of this network and present your answer in the following format: [UserA, UserB, UserC, UserD, ...].
test