If the letters represent unknowns they are usually called variable.
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In math joint sets are contain at least one element in common. An example of joint sets are {1,3,8,4} and {3,9,1,7}.
In sets it means intersects. like what is common in both sets
The union of two sets A and B is a set that consists of all elements which are either in A, or in B or in both.
It is the property that 1 is the multiplicative identity for sets of numbers.
There are no cheats on the skill sets. I can't even finish game 3 on skill set 2. I am also looking for cheats for skill sets, but I found out that there are no cheats for the skill sets. Sorry.