Tests if the neuron's in slot contains the value test. Both slot and test can be any Lisp forms. The slot is an integer refering to one of the the neurons inputs. Position refers to the test position and it is relative to the current position (default 0).
(in 1 'a) tests if slot 1 contains 'a at the current pos.
(in 2 'a -1) tests if slot 2 contains 'a in previous pos.
(in 2 'a +1) tests if slot 2 contains 'a in future+1 pos.
FIRE SYNTAX
(in slot position)
This returns the context of in slot at position. It is used in neuron's fire part and activated when the neuron input tests become true.