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Sometimes, you need to refer to an already-built node, but you don't
know what identifier SNePS has given it. To handle cases like this, you
can create a pointer to the node when you build it that has a mnemonic name (a
SNePSUL variable) that you give it, so that you'll remember what it is.
This can be done by using the infix `=' operator, as shown in the
(UM§2.9). First, reset the network
and undefine all user-defined relations
(UM§2.8); this is done
by giving resetnet the argument t. So,
4.1. SNePSUL Variables as Pointers
William J. Rapaport