How to write a condition under which 3 variables are not equal to each other?

Question

Swift

How to write a condition under which 3 variables are not equal to each other?
There are 3 variables hero, smoke and recycle.
I need them to be not all equal to each other, i.e. contained different values. How to describe it in a condition?
This is the code that doesn't work:

smoke != hero && smoke != recycle && recycle != hero

Answer 1

a = 1
b = 2
c = 3

if a != b && a != c && b != c
// все данные разные
end

Answer 2

Make the checking function a crutch "If-else". And also. Why do you need this? Explain the reason

Answer 3

Instead of && you can (recommended) just write ","
State the problem in its entirety, otherwise the options above are quite suitable