Book, Paragraph

1      I,  24| exterior angles are equal to four right angles because they
2     II,  1 |    we know. They are in fact four:-(1) whether the connexion
3     II,  2 |       2~These, then, are the four kinds of question we ask,
4     II,  11|     the cause, and there are four causes: (1) the definable
5     II,  17|     external angles equal to four right angles is an attribute
6     II,  17| external angles are equal to four right angles). And the middle