Commonsense Knowledge bases contain pieces of knowledge like –
If you take a cab ride, you will have to pay fare at the end of it.
This is not actually a piece of knowledge; it is a thought. It is an observation. But all thought ultimately is, or rather becomes, knowledge. Hence it is knowledge – in that sense. The thought that nothing can travel faster than the speed of light first occurred to Einstein. Then, it became knowledge. All thought is first a thought and eventually knowledge.
Once you have the basic definitive knowledge of cab, ride and fare, you need not know the above piece of “knowledge” separately again. It is clearly a thought, overlapping 3 concepts. The knowledge lies in the descriptive definitions of the terms in the piece; the particular linguistic arrangement (If you take a cab ride, you will have to pay fare at the end of it) of the contents from the 3 pools is the thinking – a connecting thought (perhaps tautological).
(Note : in this example, the basic definitive knowledge of a cab itself is actually sufficiently a source of the given “knowledge” piece. But in other cases of commonsense, like say, ‘Countries have leaders’, the basic definitive knowledges of the terms combine to yield the given piece.)