- unwanted pieces of materials which have become embedded in a sheet of paper.
- A pair of categorical propositions which (provided that we assume existential import) cannot both be true, but can both be false. In the traditional square of opposition, an A proposition and its corresponding E are contraries. ...
- Materials unsuitable for papermaking, present in some raw materials and waste paper.
- Unsuitable material found in the components of a paper furnish, which must be removed from the pulp stock before making it into paper- for example paperclips, string, plastics, or shives.
- are two propositions which cannot be both true together, but could be both false. (Study 2)
- Unwanted materials in a waste stream.