But the initial definition of SimpleTruthValue (in Probabilistic Logic Networks, 2008) defines it as follows:
```
SimpleTruthValues, which consist of pairs of numbers. These pairs come in two forms:
  - the default, <s,w>, where s is a strength and w is a “weight of evidence” – the latter 
being a number in [0,1] that tells you, qualitatively, how much you should believe the 
strength estimate. The letter w will habitually be used to denote weight of evidence values.

  - <s,N>, where N is a “count” – a positive number telling you, qualitatively, the total
amount of evidence that was evaluated in order to assess s. There is a heuristic 
formula interrelating w and N, w=N/(N+k) where k is an adjustable parameter. The 
letter N will habitually be used to denote count. If the count version rather than the 
weight of evidence version is being used, this will be explicitly indicated, as the 
former version is the default.
```