แสดงชื่อนักเรียนทุกคนที่มีเพื่อนและมีคนอื่นชื่นชอบด้วย
Show name of all students who have some friends and also are liked by someone else.
df1 = pd.DataFrame(columns = ['name','id'])
df2 = pd.DataFrame(columns = ['student_id','liked_id'])
df3 = pd.DataFrame(columns = ['student_id','liked_id'])
df1[(df1['id'].isin(df2['student_id'])) & (df1['id'].isin(df3['liked_id']))]['name'].values.tolist()