If giving gifts, do NOT give in groups of 3, 3 is a taboo/sacred number.
--Malae
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If visiting a friend do NOT bring flowers, unless you know they were raised abroad, flowers are associated with funerals, and can be interpreted as you hoping they die young/soon.
--Malae
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If you are a woman, be care sitting in the front seat. This can be interpreted as romantic/sexual interest in the driver, and can lead to sexual harassment. If you're nervous, sit near older women, their presence usually deters harassment.
--Malae