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It's not so much fighting. Sometimes, it just ignore but sometimes it comes to rub.
as for the ear, there's reason for that which is still controversial but Singapore is not the only one that does it.
if you are interested, you can read this:
http://www.goodpaper.sg/an-ear-tipped-a-life-saved/

Thank you for the link. It's a big thing to take care of and protect cats. It's good that there is such a community.

you're welcome