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Below, the simple basic rules that define a correctly wire-numbered sub-node are stated.

 

oEach outgoing wire-number must have a corresponding identical ingoing wire-number within the same wire-chain.

 

oThere must never be two wires with the same wire-number in the same wire-chain.

 

oEach wire-chain must have a beginning and an end.

 

These rules can be expressed in other ways as well, but the meaning is still the same.

 

Here is a second way of putting the same thing:

 

oIn the beginning of a wire-chain, there must be a connection point with one outgoing wire-number only.

 

oIn the end of a wire-chain, there must be a connection point with one ingoing wire-number only.

 

oIn all other connection points of the same wire-chain, there must be both an ingoing and an outgoing wire-number, where the ingoing and outgoing wire-numbers must differ.

 

oEach wire must have a wire-number that is unique within the wire-chain.

 

It might be obvious and should perhaps go without saying, but nevertheless, below you will find an additional rule that also applies.

 

oConnection points which are not connected to anything, should not have any wire-number symbols.

 

Perhaps somewhat surprising, it is not more complicated than so.