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The following answers are quoted from GPT-3 model, please use them wisely:
根据上面的边集，一共有5个顶点，顶点1，2，3，4，5。度为3的顶点有1和4。
可用下面的Python代码实现：
graph = {1: [2, 3, 4], 2: [1, 3, 5], 3: [1, 2, 5], 4: [1, 5], 5: [2, 3, 4]}
degree = 3
count = 0
for vertex in graph.keys():
if len(graph[vertex]) == degree:
count += 1
print("度为" + str(degree) + "的顶点个数有" + str(count) + "个")
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