A belongs to b, b subset c, a not a subset of c

1. The problem statement, all variables and given/known data
a∈b, b⊆c, a not ⊆ c
(in other words, the last subset symbol should have a line from top to bottom)

2. Relevant equations


none
3. The attempt at a solution

ive tried a million things, I cant find anything that doesnt break one of the conditions

the most recent attempt is that
A, B and C are all empty sets, but that would imply that a can be an element of B. my logic is that a doesnt contain all the elements of c, because there are no elements of c

every other thing ive tried has c containing all the elements of B, but since B contains all the elements of A, i run into a logical problem.

I tried for a long time on this one, and I really need help