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Question: How to check if multiple variables are different?

Question:How to check if multiple variables are different?

emerald000 5 Maple 13
multiple
October 21 2011
1

I am looking for a way to check if multiple variables are different. Let's say I have 4 variables named a, b, c and d. You can do it with "a!=b and a!=c and a!=d and b!=c and b!=d and c!=d", but it quickly becomes impractical when you have more variables.

 

Can anyone shed some light on this?

Thanks!
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