JESS: compare slots but only with the last two instances

hi fellows,
it's me again :)
i wrote to you about a week ago. i wanted to compare slots but i didnt get
any answers. i realised the question was very "dumm".
i foun the solution on my own.
but now i have a bigger problem.
i just want to compare the slot of an instance but only with the last two
instances and the next two instances...
is this possible!?
thank you for your time !