Full Idea
Square of Opposition: 'all A are B' and 'no A are B' are contraries; 'some A are B' and 'some A are not B' are sub-contraries; the pairs 'all A are B'/'some A are B' and 'no A are B'/'some A are B' are contradictories.
Gist of Idea
The Square of Opposition has two contradictory pairs, one contrary pair, and one sub-contrary pair
Source
Rom Harré (Laws of Nature [1993], 3)
Book Reference
Harré,Rom: 'Laws of Nature' [Duckworth 1993], p.62
A Reaction
[the reader may construct his own diagram from this description!] The contraries are at the extremes of contradiction, but the sub-contraries are actual compatible. You could add possible worlds to this picture.
Related Idea
Idea 9405 Square of Opposition: not both true, or not both false; one-way implication; opposite truth-values [Aristotle]