Book, Paragraph

 1     II,  1 |      also define the errors that occur in problems. They are of
 2     II,  6 |         is his soul.~Some things occur of necessity, others usually,
 3     II,  6 |       event has been asserted to occur usually, or if a usual event (
 4     II,  6 |     contrary) has been stated to occur of necessity, it always
 5     II,  6 |       event has been asserted to occur usually, clearly the speaker
 6     II,  8 |       converse sequence does not occur: the sequence is always
 7      V,  5 |         some cases this does not occur, as it does not, in fact,
 8     VI,  2 |        then the same object will occur in two genera of which neither
 9     VI,  13|          the pain occurs; but to occur "because of" a thing is
10     VI,  13|      thing is not the same as to occur "+ a thing" in any of its
11     VI,  14| contraries are equally liable to occur, and the thing has been
12     VI,  14|          are naturally liable to occur in it? Such is the definition