Two terminal devices circuit puzzle

I came across the following puzzle which involves circuits and two
terminal devices but i think it's basically a mathematical puzzle. But
i am unable to understand it.
In any circuit containing only "two terminal" devices we can always
find two "links" whose removal (not simultaneous)
still left all the components connected to each other by wires.
a hint was also given : consider an unplugged toaster as a valid
circuit in this puzzle.
I am unable to understand what is a circuit with "two terminal"
devices and what are "links" in it.
Can anyone give an example of such a circuit in which the above
property holds.
I think this problem can be converted into graphs. But i dont know how
if it is possible?
Please help.
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