How does the calligraphy teacher express his gratitude by sending couplets to students after class?

The calligraphy teacher sends couplets to the students after class to express his gratitude and say thank you to the teacher. The teacher sends couplets to the students and says thank you to the teacher, thanking the teacher for his dedication and concern. Calligraphy teachers are teachers engaged in calligraphy education in institutions of higher learning or primary and secondary schools, and have rich knowledge of Chinese studies and calligraphy teaching theory.