Knot
Node (Connective Junction) 
 — this is the junction point of the transitions in the system. A node can be a junction point, a branch point, or a transition endpoint.
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 If a transition from a node forms a cycle, then there must always be an unconditional transition from each node of the cycle in order to avoid a solver error. For example: 
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Using nodes and transitions (without states), you can build transition graphs.

