Bullying in school

Bullying is defined by the Department of Education and Skills guidelines as unwanted negative behaviour, verbal, psychological or physical, conducted by an individual or group against another person (or persons) and which is repeated over time. Placing a once-off offensive or hurtful public message, image or statement on a social network site or other public forum where that message, image or statement can be viewed and/or repeated by other people is also regarded as bullying behaviour.

thats true!!!
actually i dont really care about it before, but a week ago when i gether with my students they changed my point of view about bully in the school.
some of my students share about their expirience facing bullying in school.
they still at elementary school. i was really sad when i hear that .
one of them told me that in their class have a group of students who like to bully other friends.
if you were me what would you say ?
give a suggestion? if thats world come up in your mind, of course i did. i gave them some suggestion related to the issues.

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Here,
i just want to say that please stop bullying now. because everyone has the same right to be happy.