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sneeze rule
(slrpnk.net)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
In Greece we say "Γείτσες", which is a dimunitive for "Υγεία" (=Health), so essentially its like wishing the other person to be healthy.
We say the same in the Netherlands, and sometimes we also say the equivalent for "cheers", not sure why though.